The Company Yahoo Essay Example | Topics and Well Written Essays - 750 words

The Company Yahoo - Essay Example As the discussion stresses, the company was on the height of its success at the time of dot-com boom in 2000 when its stock price plunged to record high. Yahoo! also started its free mail service in response to the release of Google’s Gmail in 2004. In the following year, the company took over Flickr, a thriving photo sharing service. Yahoo! continued to expand by acquiring and purchasing innovative business in need of capital. The range of services offered by Yahoo! also rose in the year 2005 when the company stepped into Web 2.0 services. MSN Messenger and Yahoo! Messenger became interoperable in 2005 which was another great achievement for the company. Yahoo! also allowed its mail users unlimited free space in 2007 as it removed the barrier of 1GB storage. In 2008, in the time of recession, the company announced the layoff of 1000 employees. The company was facing difficulties in competing with the efficient Google. The main revenue model for the company was advertising ini tially. Afterwards, the company started making money from the augmented services that it offered. Efficient management of capital and reduction in expenditure helped the company to gain its profitability in the pure internet business. In 2008, the company was approached by Microsoft for the offer of a merger. However, Yahoo! rejected the offer of Microsoft as the share price being offered was very low. Recently, Yahoo! webpage is seen to be changed and a new version is launched called the Metro. This new look also has links to famous applications such as Facebook.com and Netflix. E-commerce website like Yahoo! needs to constantly innovate and develop new features on the website to attract more users and subscribers. The company right now faces lack of originality as it is engaged in merging and acquiring already established businesses like Flickr. The customer data which is private should not be used by the company to be sold to marketing agencies.

Research Spotlight on Homework Essay Example for Free

Research Spotlight on Homework Essay Some researchers are urging schools to take a fresh look at homework and its potential for engaging students and improving student performance. The key, they say, is to take into account grade-specific and developmental factors when determining the amount and kind of homework. So, whats appropriate? What benefits can be expected? What makes for good homework policies? Research doesnt have all the answers, but a review of some existing data yields some helpful observations and guidance. How Much Homework Do Students Do? Survey data and anecdotal evidence show that some students spend hours nightly doing homework. Homework overload is the exception rather than the norm; however, according to research from the Brookings Institution and the Rand Corporation (see the Brown Center 2003 below). Their researchers analyzed data from a variety of sources and concluded that the majority of U.S. students spend less than an hour a day on homework, regardless of grade level, and this has held true for most of the past 50 years. In the last 20 years, homework has increased only in the lower grade levels, and this increase is associated with neutral (and sometimes negative) effects on student achievement. How Much Is Appropriate? The National PTA recommendations fall in line with general guidelines suggested by researcher Harris Cooper: 10-20 minutes per night in the first grade, and an additional 10 minutes per grade level thereafter (e.g., 20 minutes for second grade, 120 minutes for twelfth). High school students may sometimes do more, depending on what classes they take (see Review of Educational Research, 2006). What are the benefits? Homework usually falls into one of three categories: practice, preparation, or extension. The purpose usually varies by grade. Individualized assignments that tap into students existing skills or interests can be motivating. At the elementary school level, homework can help students develop study skills and habits and can keep families informed about their childs learning. At the secondary school level, student homework is associated with greater academic achievement. (Review of Educational Research, 2006) What’s good policy? Experts advise schools or districts to include teachers, parents, and students in any effort to set homework policies. Policies should address the purposes of homework; amount and frequency; school and teacher responsibilities; student responsibilities; and, the role of parents or others who assist students with homework. Reference: Cooper, H. (2003). A synthesis of research. Review of Educational Reseach, volume 76, Retrieved January 09, 2013, from http://www.nea.org/tools/16938.htm Reasons why students should not have homework Homework is supposed to ensure that all students retain the material covered in the classroom, but for many children it is an unnecessary chore and actually hinders their learning. Children learn best when they are interested in the subject. Positive mental attitude makes learning even challenging things much easier. Negative mental attitude, however, makes retaining knowledge harder and creates stress in a learner. It also takes much longer periods of time to complete. As a result children hardly have any time to develop their talents through extracurricular activities, or to spend adequate time with family and friends. Instead of being burdened with much resented huge loads of homework, children should have the opportunity for more self-directed and interactive learning at school to generate their interest and build in them positive attitude towards learning. Teachers should be more creative and use multimedia like computers and video presentations to make covered subjects more engaging involving childrens input more. Students should be allowed to suggest activities and projects they would like to do. In the present school system it is usually the teacher who decides what and how children should learn in class and at home. This promotes passivity and a sense that learning is a necessary evil rather than exiting opportunity to learn about the world we live in. This is very ineffective, making kids bored, stressed, and frustrated. Not to mention that it is often parents who do the reluctant kids homework therefore homework doesnt help them to learn at all. They get their grades, but end up having learning gaps that will come out later on and hinder their success. Children who are struggling themselves with loads of homework lack the time to develop other than academic passions and experience very unhealty stress that cen result even in a depression. The numbers of children who take antidepressants is rapidly growing. Students who are defiant about their homework often have very strained relationship with their parents. It is a source of contention in too many families and contributes to deep emotional problems in these children and also inevitably may cause depression and substance abuse. The age of kids taking street drugs is getting lower and lower. Children as young as ten in some countries have a drinking problem and homework overload can be an indirect cause of that. That is why I think students should not have homework, but be able to have enjoyable learning experience at school and freedom to be encouraged by the teacher to expand their knowledge on their own terms at home, and to be rewarded for the extra effort instead of being forced to do homework they dont like. Reference: Tehrani, E. (2009). Reasons why students should not have homework. Retrieved January 09, 2013, from http://www.helium.com/items/1309973-why-students-shoul-not-have-homework The Truth About Homework In high school, some studies do find a correlation between homework and test scores (or grades), but it’s usually fairly small, and it has a tendency to disappear when more sophisticated statistical controls are applied. Moreover, there’s no evidence that higher achievement is due to the homework even when an association does appear. It isn’t hard to think of other explanations for why successful students might be in classrooms where more homework is assigned—or why they might spend more time on it than their peers do. The results of national and international exams raise further doubts. One of many examples is an analysis of 1994 and 1999 Trends in International Mathematics and Science Study, or TIMSS, data from 50 countries. Researchers David P. Baker and Gerald K. LeTendre were scarcely able to conceal their surprise when they published their results last year: â€Å"Not only did we fail to find any positive relationships,† they wrote, but â€Å"the overall correlations between national average student achievement and national averages in [amount of homework assigned] are all negative.† Consider the assumption that homework should be beneficial just because it gives students more time to master a topic or skill. (Plenty of pundits rely on this premise when they call for extending the school day or year. Indeed, homework can be seen as a way of prolonging the school day on the cheap.) Unfortunately, this reasoning turns out to be woefully simplistic. Back â€Å"when experimental psychologists mainly studied words and nonsense syllables, it was thought that learning inevitably depended upon time,† the reading researcher Richard C. Anderson and his colleagues explain. But â€Å"subsequent research suggests that this belief is false.† The statement â€Å"People need time to learn things† is true, of course, but it doesn’t tell us much of practical value. On the other hand, the assertion â€Å"More time usually leads to better learning† is considerably more interesting. It’s also demonstrably untrue, however, because there are enough cases where more time doesn’t lead to better learning. In fact, more hours are least likely to produce better outcomes when understanding or creativity is involved. Anderson and his associates found that when children are taught to read by focusing on the meaning of the text (rather than primarily on phonetic skills), their learning does â€Å"not depend on amount of instructional time.† In math, too, as another group of researchers discovered, time on task is directly correlated to achievement only if both the activity and the outcome measure are focused on rote recall as opposed to problem-solving. Carole Ames of Michigan State University points out that it isn’t â€Å"quantitative changes in behavior†Ã¢â‚¬â€such as requiring students to spend more hours in front of books or worksheets—that help children learn better. Rather, it’s â€Å"qualitative changes in the ways students view themselves in relation to the task, engage in the process of learning, and then respond to the learning activities and situation.† In turn, these attitudes and responses emerge from the way teachers think about learning and, as a result, how they organize their classrooms. Assigning homework is unlikely to have a positive effect on any of these variables. We might say that education is less about how much the teacher covers than about what students can be helped to discover—and more time won’t help to bring about that shift. Regardless of ones criteria, there is no reason to think that most students would be at any sort of disadvantage if homework were sharply reduced or even eliminated. But even if practice is sometimes useful, we’re not entitled to conclude that homework of this type works for most students. It isn’t of any use for those who don’t understand what they’re doing. Such homework makes them feel stupid; gets them accustomed to doing things the wrong way (because what’s really â€Å"reinforced† are mistaken assumptions); and teaches them to conceal what they don’t know. At the same time, other students in the same class already have the skill down cold, so further practice for them is a waste of time. You’ve got some kids, then, who don’t need the practice, and others who can’t use it. Furthermore, even if practice were helpful for most students, that wouldn’t mean they needed to do it at home. In my research, I found a number of superb teachers (at different grade levels and with diverse instructional styles) who rarely, if ever, found it necessary to assign homework. Some not only didn’t feel a need to make students read, write, or do math at home; they preferred to have students do these things during class, where it was possible to observe, guide, and discuss. Finally, any theoretical benefit of practice homework must be weighed against the effect it has on students’ interest in learning. If slogging through worksheets dampens one’s desire to read or think, surely that wouldn’t be worth an incremental improvement in skills. And when an activity feels like drudgery, the quality of learning tends to suffer, too. That so many children regard homework as something to finish as quickly as possible—or even as a significant source of stress—helps explain why it appears not to offer any academic advantage even for those who obediently sit down and complete the tasks they’ve been assigned. All that research showing little value to homework may not be so surprising after all. Reference: Kohn, A. (2006). The truth about homework. Retrieved January 09, 2013, from http://www.edweek.org/ew/articles/2006/09/06/02kohn.h26.html?tkn=RVRFTkNGGXy32nbQpdGsSFt01V8aHU5cZ3wG

A Comparison of Seamus Heaneys Poem Digging and The song of the old mo

I have looked at the poem 'Digging' by Seamus Heaney. The poem is about the poet digging into his past and appears to be a modest poem. The "nicking and slicing neatly" that Heaney says in his poem can also apply to the crafting of a poem. Heaney seems unhappy and distanced from his farming family roots however he shows a good amount of admiration for farming men. Heaney shows the skill and dignity of labour. The expertise is rather admired than the strength and the technique is very precisely explained. He constantly has memories of common places, which very few people would notice, but Heaney thinks that these memories should be recognised. He is frustrated at how different he is to his family. Maybe in those days writing poems may not have been seen as manly. I am going to compare this poem 'Digging' to another poem which is called 'The song of the old mother' written by William Butler Yeats. First of all in Heaney's poem he is talking about himself as a child to his grandfather, while Yeats is talking about the older people to the younger generation. "My grandfather cut more turf in a day, Than any other man in toners bog." This quote shows that Heaney was talking as a child to his grandfather. "And the young lie long and dream in their bed." This quote shows that Yeats is talking about the younger generation and by calling them young she is implying that she is significantly older than the people she is referring to. In both poems they describe heavy manual work, but in 'Digging' they love doing the work that they do and in 'The song of the old mother' she is unhappy and bitter that she has to scrub... ...s family had a close relationship because when he was young he did not really describe any conflict between them but in Blake's poem he does show the love of the weeping mother. When the farther kisses the child he is showing his ever nigh love of god for the child. In Blake's poem he is implying the worship of god (the farther) because he has involved god when simply a child has been lost from his parents. In Heany's poem he shows his personal love and respect for his farther and grandfather. "Once I carried him milk in a bottle Corked sloppily with paper." This quote can show in a way that he loved his farther because he cared enough to go get his farther some milk in a bottle. In conclusion I think that these poems have explored the relationships between different families from different generations.

By 112 Study Guide

Silence of the Bees: †¢ How do bees communicate? Bees communicate through dance (the waggle dance). A methodic combination of buzzing, moving the behind in a figure-eight fashion that informs other bees about pollen/ food that is found in a particular area. †¢ Why are bees so important to the U. S. agriculture industry? Honeybees are the most important pollinator on the planet. They pollinate crops, which in turn creates food to eat. What percentage of the industry do bees account for? They account for one-third (more than 30%) of the food that is produced in America.They pollinate at least 100 of our most important crops (cotton, fruits, vegetables, nuts, seeds, etc. ) †¢ What are some natural dangers to the bee industry? Natural dangers to the bee industry would be natural disasters (wildfires, hurricanes, tornados), wild animals (mainly bears) †¢ What is considered adequate pollination? †¢ What is CCD? Colony Collapse Disorder. This is a phenomenon in whic h worker bees from a beehive/colony abruptly disappear. When did it become a noticeable problem? Winter 2006 is when the issue was noticed, but it wasn’t until the following spring that it was named CCD and was being researched heavily. What are characteristics of CCD versus other hive disturbances/illnesses? The bees are completely vanishing, as opposed to a mite infestation where the bees would be crawling on the ground. Also, other insects leave infected hives untouched †¢ What types of crops are affected by CCD? A lot of crops are affected, all the crops that are pollinated by bees! In the video, blueberries, oranges, apples, cantaloupes (travel 55 hundred miles per year). †¢ Where do we get new bee colonies in the U. S. for industry use? We import bees from Australia.The Australian bees are the bees that could have potentially carried CCD to the US. †¢ What are factors thought to possibly contribute to CCD? Pesticides (which impair bees ability to learn ca using them to forget their way back to the hive), cell phones interfere with be navigation, mites, or a pathogen causing this rare occurrence are all factors that scientists have thought to contribute to CCD †¢ If CCD continues, what would happen to the agricultural industry? Ultimately the agricultural business would die, food expenses would rise, unless we are willing to use hand pollination. What if any crops would be left? The crops pollinated by the environment (wind or rain) Examples are corn wheat, rooted crops (potatoes, carrots, etc. ) †¢ What is the approximate lifespan of worker bees? The approximate lifespan of a worker bee is 28-35 days †¢ What sex are worker and drone bees? Worker bees are female (collect pollen and pollinate other flowers) and drone bees are male (sole purpose= mate with queen) †¢ What is HFCS? High Fructose Corn Syrup †¢ According to the case study, what impact might HFCS have on CCD? If not stored properly, substances within HFCS will form HMF (hydroxymethlfurfural). According to the article used in the case study, what major issues/concerns were addressed by the authors? The first issue is how commercial workers are storing the HFCS in transportation. Also, how the apples will get pollinated if the bees keep dying/disappearing. †¢ What are the advantages to the commercial use of HFCS? It is easy to store if properly stored, stable shelf life (will hold for a long period of time), and cheap (because we have a lot of it; it is easy to find and purchase). It is used to sweeten foods. Earthworms: †¢ Which side of the worm did we cut into? We cut into the dorsal side of the worm (the back).The dorsal side of the worm was smooth and darker than the ventral side (the underside) †¢ Know the purpose of all the organs we discussed. Dorsal side is dark and feels smooth Ventral side is lighter and has a rough feel caused by setae Setae – Bristles that aid in providing traction for movement M etameres are the body segments that are internally separated by septa Clitellum – the light-colored cylindrical structure close to one end of the worm -a glandular organ that produces mucus for copulation -secretes the cocoon into which eggs are deposited â€Å"Head† or Anterior end of worm is the one closest to the clitellum – at he tip is the mouth Posterior or Caudal – anus (where waste is removed) is located here. Oviducts –small openings located on the ventral side where eggs emerge; followed by sperm ducts (located on segments 14 and 15) Cerebral Ganglion (â€Å"brain†) – located at the cranial tip of the worm Aortic Arches (heart) – 5 around the esophagus; pump blood in a closed circulatory system †¢ What is coelomic fluid and why is it important for earthworms? The coelomic fluid is located in the coelom (body cavity) that acts as a hydrostatic skeleton to support the body and aid in movement.What is the typhlosole ? The typhlosole is the fold or ridge in the intestine that increases efficiency. †¢ Why do we dissect Earthworms? We dissect earthworms because they are a great introductory specimen. They lack a skeleton which makes dissection easier. They have some organs of more highly evolved organisms such as a closed circulatory system and simple digestive system. †¢ What type of circulatory system do earthworms have? Earthworms have a closed circulatory system with hemoglobin and amebocytes. They are the simplest organism with a closed system.Blood is pumped by a heart through vessels and doesn’t fill the body cavity. †¢ What do earthworms eat? Earthworms eat organic matter such as leaf, litter, animal waste, etc. †¢ How do earthworms obtain oxygen? Earthworms must absorb oxygen via diffusion through their moist skin because they don’t have any respiratory organs. How does their habitat affect this? Earthworms are burrowers found within rich soil which stays moist, aiding in the earthworms obtaining of oxygen. If earthworms dry out or the soil dries out, they die (suffocate) because oxygen can’t diffuse into their skin.These creatures have adapted by doing two things: 1) slowing down bodily functions during dry spells to conserve water 2) they can lose up to 70% of their body water before dying in this condition. †¢ How do earthworms reproduce? Earthworms reproduce sexually even though they are hermaphrodites. During mating, both worms exchange sperm to fertilize the eggs. This is an advantage because it creates more genetic diversity. †¢ Be able to identify structures in drawings like those in the handout. [pic] [pic] [pic] †¢ Know directional terms. Posterior – towards the caudal end (foot/tail)Anterior – towards the forward end (head) Dorsal – back side of the animal Ventral – bottom side of worm; tummy side †¢ Know the definitions of the external & internal structures we discus sed while dissecting the earthworm. EXTERNAL †¢ Dorsal side is dark and feels smooth †¢ Ventral side is lighter and has a rough feel caused by setae †¢ Setae – Bristles that aid in providing traction for movement †¢ Metameres are the body segments that are internally separated by septa †¢ Clitellum – the light-colored cylindrical structure close to one end of the worm o a glandular organ that produces mucus for copulation secretes the cocoon into which eggs are deposited †¢ â€Å"Head† or Anterior end of worm is the one closest to the clitellum – at the tip is the mouth †¢ Posterior or Caudal – anus (where waste is removed) is located here. †¢ Oviducts –small openings located on the ventral side where eggs emerge; followed by sperm ducts (located on segments 14 and 15) INTERNAL Reproductive System: †¢ Know the path taken by sperm to exit the male body during ejaculation. Be able to explain includi ng all glands and secretions on the path.At the time of ejaculation sperm leaves the epididymis via the vas deferens. As it goes through the vas deferens to the urethra it picks up the following fluids in order: nutritive fluid from the seminal vesicles ( milky alkaline fluid from the prostate ( mucous fluid for lubrication from the Bulbourethral gland/Cowper’s gland. †¢ Why are so many sperm produced? So many sperm are created because not all of the sperm make it to the egg. Many die trying to fight their way through the acidity/stickiness of the female reproductive organs.Sperm must work extremely hard to reach the egg and once it gets to the egg it must continue its rough journey breaking through the zona (hard outer shell of the egg) †¢ Know the definitions of male and female reproductive terms discussed in class. MALE= penis Penis – composed of 3 cylinders of erectile tissue: o Corpus cavernosa – 2 cylinders on dorsal part of the penis o Corpus Sp ongiosum – surrounds the urethra; distal end is enlarged to form the glans penis Scrotum – thin membranous sac that houses testes. Testes o Produce approx. 200-300 million sperm/ 24hrs in each testes o Approx. 700 ft. f seminiferous tubules – 80% of testes. o Essential male organs o Proper function is dependent on temperature Epididymis: o Located over the top back portions of the testis o Store immature sperm Vas Deferens – Tube through which sperm leave the epididymis during ejaculation Seminal Vesicles – add nutrient rich fluid for sperm Prostate: o Golf ball size o Produces a milky alkaline fluid – possibly to help with proper function of the flagella Bulbourethral Gland/ Cowper’s Gland– produces a mucous fluid to act as lubrication during ejaculation. FEMALE= vagina ? Folds of tissue that are covered with hair on the outside ?Smooth and moist inside folds ? Located between bladder and rectum ? Capable of great expansion to allow fetal development ? Lined with endometrium ? lead from uterus to ovaries ? Have fimbriae extensions at end by ovaries to catch released eggs. ? Ova production begins about the 7th week of embryonic development ? At birth each ovary contains approx. 1 million follicles with the potential to develop into eggs ? Approx. 80% of follicles degenerate by puberty leaving about 400,000 ? Only about 400 eggs will mature throughout reproductive life of female †¢ Why do so many sperm not survive?So many sperm don’t survive because of their short lifespan and the environments each individual sperm encounters after entering the vagina. For example: the vagina is acidic so approx. 25% of the sperm die immediately upon entry. Once the environment becomes fluid again, the sperm remain viable for 28-48 hours before sperm run out of nutrients and starve. The female defense system attacks sperm as foreign invaders. And the sperm must make it through the cervix (usually thick mucus) which secretes a protein fluid called musin. Once it gets through the cervix, it enters the uterus moving through the uterine cavity.The flagella of the sperm must work harder to go up the fallopian tube (swimming against current) finally reaching the EGG! 60% of sperm is less than perfect. †¢ What is the difference between sperm and semen? Sperm is the male sex cell of semen that fertilizes an egg, whereas semen is the combination of fluids and sperm that leave the penis via the urethral opening. Semen is sperm mixed with nutritional fluid from the seminal vesicles, alkaline fluid from the prostate, and mucus from the Bulbourethral/cowper’s gland †¢ Be able to identify and label the male anatomy. [pic] Be able to identify and label the female anatomy. [pic] [pic] †¢ What are the male and female sex organs? Know the composition/purpose of each and be able to compare the two. MALE= penis Penis – composed of 3 cylinders of erectile tissue: o Corpus caverno sa – 2 cylinders on dorsal part of the penis o Corpus Spongiosum – surrounds the urethra; distal end is enlarged to form the glans penis Scrotum – thin membranous sac that houses testes. Testes o Produce approx. 200-300 million sperm/ 24hrs in each testes o Approx. 700 ft. of seminiferous tubules – 80% of testes. Essential male organs o Proper function is dependent on temperature Epididymis: o Located over the top back portions of the testis o Store immature sperm Vas Deferens – Tube through which sperm leave the epididymis during ejaculation Seminal Vesicles – add nutrient rich fluid for sperm Prostate: o Golf ball size o Produces a milky alkaline fluid – possibly to help with proper function of the flagella Bulbourethral Gland/ Cowper’s Gland– produces a mucous fluid to act as lubrication during ejaculation. FEMALE= vagina ? Folds of tissue that are covered with hair on the outside ?Smooth and moist inside folds to cap the ends of the corpus carvernosa (similar tissue to that of the corpus spongiosum in males) ? Located between bladder and rectum ? Capable of great expansion to allow fetal development ? Lined with endometrium ? lead from uterus to ovaries ? Have fimbriae extensions at end by ovaries to catch released eggs. ? Ova production begins about the 7th week of embryonic development ? At birth each ovary contains approx. 1 million follicles with the potential to develop into eggs ? Approx. 0% of follicles degenerate by puberty leaving about 400,000 ? Only about 400 eggs will mature throughout reproductive life of female †¢ What is the purpose of each reproductive structure covered in class? Answered in the above question. †¢ Know all of the glands and organs involved in the endocrine system along with their functions †¢ Consists of glands that produce hormones to regulate: growth, reproduction, metabolism, personality, etc. †¢ Hormones – highly specialized chemi cals that act as messages to organs; carried in the blood stream throughout the body. Pituitary gland (Hypophysis) – produces growth hormone and regulatory hormones †¢ Thyroid – produces thyroxin which regulates metabolic rate †¢ Hypothalamus – secretes regulatory hormones †¢ Parathyroid – regulates calcium and phosphate levels in blood †¢ Adrenal gland – produces corticosteroids, epinephrine (adrenaline), and norepinephrine †¢ Pancreas – islets of Langerhans produce insulin; rest of pancreas produces digestive enzymes †¢ Ovaries – Estrogen, progesterone †¢ Testes – testosterone †¢ How many eggs are matured during one female cycle?Females are born with 1,000 eggs and over a lifetime only 400 eggs reach maturation, but during ONE female cycle a SINGLE is matured and sent out to be fertilized. †¢ How long is an average female cycle? An average female cycle = 28 days †¢ Know the ph ases of the menstrual cycle in detail. o Average of 28 day cycle o Involves release of mature egg, shedding of old endometrium and formation of new endometrium o Follicular phase – first 14 days of cycle ? 1st week: old endometrium is shed (menstruation); follicular development begins ? nd week: formation of new endometrium; follicular development continues ? Ovulation: release of mature ovum around the 14th day; egg has approx. 24 hrs. to join sperm. o Luteal phase – endometrium continues to prepare for possible implantation of embryo o If implantation does not occur by the end of the 28 day (average) cycle then menstrual bleeding occurs and the cycle begins again. †¢ Know the embryonic and fetal development discussed in the power point, video, and in your book. -Blastocyst – 5 days after conception -Implantation occurs within 10 days -4 weeks = arm buds, beginning of eyes 5 weeks = nose -6 weeks = leg buds embryo< 0. 5 inches -7 weeks = ? inch; clearly de fined fingers, visible internal organs and eye lenses -8 weeks = well defined fingers and toes -10 weeks = embryo=fetus; can move; approx. 2 inches long -14 weeks = fetus can bring hands together and suck thumb -15 weeks = sensory organs are almost complete -16 weeks = can actively turn -Fetal respiration = baby â€Å"breathes† fluid in and out. †¢ What is spermatogenesis? The production of sperm begins between the ages of 9-12 †¢ Know the structure of sperm and how/where they form and develop. pic] -Sperm is manufactured in the testes (testicle) in the seminiferous tubules. -Immature sperm are stored in the epididymis until ready for ejaculation. -Haploid cells (23 chromosomes) -Comprised of general three parts: headpiece, midpiece, flagellum †¢ What is the average production rate (may be a range) of sperm in a healthy male? More than 400 billion sperm is produced in lifetime and 200-300 million sperm produced daily. In normal semen, there is approx. 39 millio n (range from 33-46 mil) sperm/ejaculation

Dialogue Between Plato and Aristotle Essay

Pluto: No, listen. What I am saying is that the environment or form that we live in is full of unevenness, imperfection and impurity this due to the fact that this form is merely a copy of the ideal world that one would understand once they rise above our physical environment and grasp it intellectually. Aristotle: I understand you just fine but I disagree with you. I agree that our world is an imperfect world but I object to the notion that it is not real or that there is another invisible form out there from which it is cloned. I find that preposterous, everything is right here on earth, physically. Pluto: No. What we see on earth ‘physically’ as you say are just mimics or artificial replicas of the real thing only with a lot of imperfections. This is just an illusion of the real thing. Aristotle: How can that be when our natural world is real and physical? Let me explain it to you clearly, our world, this world is made up of many forms. Sure, they may not be ideal, pure or perfect but our senses identify with them. Pluto: Well, our senses identify with them because they are copies of the perfect form and we have knowledge of them. Let me explain it to you. Knowledge must have as its object that which is openly real as juxtaposed with that which is an appearance only, that which is fully real must be fixed, permanent and unchanging- in the realm of being as opposed to that which is in the realm of physical. That is why you call these world ‘physical’ when it is just a perception from the true ideal form. Aristotle: That is absurd! If experience has shown us anything is that individual substances exist and are real, being predicated of the substance and that an individual is not produced by some idea or model the actually exist! Pluto: Now you have joined people inexperienced in the theory of forms. Captives in a cave, bound to the wall with no likelihood of turning your heads. With fire burning behind you, you can only see the wall of the cave and the shadows of the puppets placed between you and the fire. You are incapable to fathom that the shadows you see and the echoes you hear are a reflection of real objects, behind you. This world that is available to our senses exists only as a reflection of the real world. Aristotle: Here is where I differ to you completely! !An individual is not formed from the perception of another’s  mind but from an individual who through germ or seed was able to reproduce another one hence, the seed in the individual would be in potency form because of its capacity to become an individual in future. Every individual is a compound of matter and form, not a mirror or perception of another from another form. Pluto: That is just how easy it is to mistake appearance for reality, just like the captives in the cave experience, they easily refer to the shadows using the names of the real objects that the shadows reflect. This just shows that knowledge is only a reflection of the real ideas in our minds. What is seen on the earth is an imitation of the real thing. The captives, by looking at the shadows may learn what an item is but this does not enable them to claim that it refers to an object, which they have seen. Likewise, we need the physical objects in order to enable us acquire concepts. Aristotle: So your idea is that we live in an imagined world and that is copied from an ideal world and that the physical items and entities we encounter on our day to day activities and with which our senses identify with are merely there for us to acquire concepts? Pluto: Yes. Exactly! Aristotle: You are not serious! You do realize that the possibility of error forces the mind to determine the truth validity of a given statement. Meaning the intellect must have adequate reasons, which can ensure the proposed judgment conforms to reality. These are the foundation of perfect knowledge, knowledge through causes. Not that we originate from some made up form that we cannot access, but that we originate from an individual. Matter is the indeterminate element, which is unchanging, and form is the force and power shaping and developing the individual. That is a structure of two statements leading to correct reasoning. Pluto: So you object to my whole idea? Aristotle: Completely! It lacks a foundation and crumbles upon itself. Your own argument argues that there is need for physical objects to enable us acquire concepts but your idea is based on an unseen form that cannot be confirmed physically. Pluto: We could argue about it for hours. It’s a stalemate. Aristotle: Seems we have found an impasse, but I win!