what role hair do play in the human body as well as in the other animals?why human is having hair more hair on head,underarms&other places compaire to other places\nand why human being had less hair compaire to other animals
201375
To help the body in homeostasis of body temperature!Also will stand on end when frightened like a cat but due to evolving to have less hair you just get goosepimples!\n\nWe probably evolved to have less hair due to our ability to produce clothing!Possibly still have head hair as we either didnt produce hats, or it conferred some advantage such as preventing heatstroke(by protecting the back of the neck and forehead)or sexual selection.
339530
one reason may be that humans don't go running through the bush as other mammals to. onther reason is in the genes. Some mammals may have genes the control the growth of hair in some species. \n\nBut i like the thought of the first one. if we were having to run and catch our food or we had to sleep on the ground our hair may not be allowed to grow as long.
359307
Homologous parts is about comparing *two* species (or male and female from the same species).\n\nTherefore only #2 is an example of homologous parts (as it is a comparison between dogs and humans).\n#1, 3, and 4 are examples of vestigial organs (or more correctly, 'vestigial structures' ... as sometimes the thing is so useless that it can't be called an 'organ' ... like the python leg bones).\n\nBy the way, some people might question whether human ear muscles are truly vestigial, because they are operational in some people (I can wiggle my ears).  However even if they work, it's hard to find a *purpose* for them, as is needed in other species to move ears for better hearing.  Similarly, some people claim that the human appendix sometimes serves some function for fighting infection.  However, the tailbone has no apparent function ... it's just a throwback to our embryology and ancestry.
489500
Actually, "smarter" mammal have larger brains in ratio to the size of their body.  If you were to take the ratio of size/weight of a human brain and his body and compare that with an elephant, you would find that a human's ratio is much higher.  I've heard contradicting theories with regard to actual percentage used.  We do in fact use most areas of our brain.  Why other areas are not in use probably have to do with evolution.  What sets us apart from other mammals is the amount of things we create for comfort and not survival.  All animals, there may be case by case exceptions, operate under the need to survive.  We operate under what is comfortable.
226007
most mammals have four appendages, they just evolved differently. humans evolved into arms and legs with very different uses. rodent type animals have front feet they can use as hands, as do most monkeys. beasts of burden and their predators maintained four legs for obvious reasons.
215293
We arent trying to be rude. We just want to see how it feels. Like me for instance, I cant understand when you get your hair up and looking pretty, how does it not go flat when you go to sleep? If I fixed my hair like that it would probably go flat before I laid down on it. Anyways, we arent trying to be rude we are just curious
656819
Humans are born a bit more prematurely than other apes.  The reason for this is our extra-large crania and the conflict with the size of mothers' birth canals.  That said, apes are still quite helpless at birth, but are capable of holding on to fur and helping stay attached to mom (though not nearly as much as many monkeys).  Human newborns are 100% reliant on adults to carry them about.\n\nThe simple answer is not quite, but close.  As mentioned before, non-human apes will also develop much more rapidly.
65850
Well, they are there for a few reasons.  Way back in caveman days, men and women were supposed to be attracted to each others BO...yuck. And more hair there, meant more BO.  Also, pubic hair is there so there will be less friction caused by sex and things like legs rubbing together, etc.  Now, we really don't need underarm hair, but shaving pubic hair is just a matter of choice. It still does help decrease friction.
319648
It could also be where the weight is . Maybe one has more belly and one fatter legs, who knows ? All I know is that their heads weight is like half of their total body weight. Does one have a big head ?
199853
ya, body hair is eww lol...atleast 2 much of it is
303523
ACTUALLY, BODY HAIR WAS VERY SCARCE FOR INDIGENOUS PEOPLES...IT JUST WASN'T IN OUR GENES, BUT OF COURSE NOW MOST OF OUR GENES OUR SATURATED WITH THOSE OF OTHER ETHNIC GROUPS, SO IT KINDA DEPENDS ON THE INDIVIDUAL AND THEIR BLOOD LINE. I KNOW THAT ALOT OF MY MALE ELDERS HAVE VERY LITTLE OR NO FACIAL HAIR...THEN THERE'S THE WOMEN ELDERS, VERY LITTLE BODY HAIR...MY GRANDMA HAS NEVER HAD TO SHAVE HER LEGS OR ARMPITS, MY GREAT GRANDMA ALSO...THEY JUST NEVER GOT ANY, LUCKY LADIES!!!
199021
Horses have hair.  Depending on the climate, an Arabian horse will grow a substantial winter coat.\n\nIf you compare an Arabian living in California, with one living in Montana, you can visibly see the difference in their winter coats.
518662
It is believed that the functions of pubic hair include the dissemination of pheromones and protection from the friction of sexual intercourse. Natural selection may also have sustained it because it can show a potential sexual partner that the other person is sexually mature and can reproduce. Pubic hair and the growth between the tops of the legs and the buttocks, like under arm hair, helps to lubricate the areas, making movement smoother and more comfortable.\n\nThere is no definitive theory on the reason for the existence of pubic hair. The prevailing theory relates to pheromones — scents that the body produces that can be sexually stimulating to others. In this theory, the tufts of hair that grow around the genitals, as well as under the arms, capture these erotic scents. Pheromones get trapped in the pubic hair when apocrine glands release an odorless secretion on the surface of the skin that combines with bacteria decomposed by the secretions of the sebaceous glands. Humans have the same number of hair follicles as gorillas, chimpanzees and orangutans, but body hair is generally very fine or barely visible in comparison. So, while pubic hair and underarm hair might be considered the primary scent traps, they are not the only ones. For some people, scents from these areas are noticeable and consciously increase sexual arousal. Pheromones might not be obvious but may be detected subconsciously.\n\nAnother theory is that the pubic hair keeps the genitals warm. The purpose of women's pubic hair could be similar to that of the cilia in the nose, in that it prevents small foreign particles from entering the vagina. If this is true, male pubic hair may be a vestigial trait.
251168
There is no connection whatsoever, no matter what anyone may say. We people simply do whatever is natural anyway, especially when it feels fine. The best thing for us is to take care of the bodies we have, like keeping clean, taking showers regularly for example. As we get older with shaving a guy is regularly washing his face, so you get the point.
292173
It's genetic. We are all related to the animals. Look at the chimp in the zoo. Look at the face and the ears.
30897
Because we were smart enough to learn how to keep ourselves warm with out fur.\n\nGod this is going to take a long time if I try to explain the whole thing, but here goes!\n\nWe shouldn't have lasted as long as we have. The human race is weak, small, and not good at defending itself, but it is very very smart.\n\nWe don't have any poisons claws or anything to defend ourselves with, so we created weapons.\n\nNotice that gorillas walk with their knees together, and that they are harder to knock over. Notice that humans walk with their knees apart, and fall over easily.\n\nPeople were smart enough that they learned to keep them selves warm, therefore eliminating the need for fur. Notice that people still have "fur" in some places. Pubic hair, to keep from chaffing when we walk, hair on our heads to keep them warm.\n\nBasivly I guess I'm saying since we're so smart evolution took away our hair. If monkeys had figured out how to make furry jackets I'm sure they wouldn't have fur either.\n\nNone of this is written in stone anywhere. This is just what I gathered from a few AP science classes. And they are a really bad explanation at that. I could try to explain better, but I have to go.
67563
A few points of clarification.\n\nFirst an etiquette suggestion. People from Africa don’t “have hair different from ours”. You should realise that people from Africa are ‘allowed’ to use the internet too. Whatever hair type you have, you need to realise that it isn’t shared by everyone else reading.\n\n\nSecondly you need to realise that people of African decent don’t have any common hair type at all. People of African descent have straight blond hair, wavy brown hair, curly black hair and every other possible combination. In short people in Africa don’t have hair “have hair different from ours” It becomes a real problem when people speak of ‘Africa’ as though it’s some sort of united whole. People in Africa include:\n\nTypical white-skinned people of Egypt or Libya who regularly have blue eyes and blond hair.\n\nAsian Malay people of Madagascar who have the typically ‘Asian” brown skin, epicanthic fold and straight black hair.\n\nGolden-brown skinned San and Hottentot people of southern Africa who normally have an epicanthic fold and very tightly curled hair of extremely determinate growth.\n\nAnd of course all those groups blend with one another seamlessly. As a result there is simply no basis in saying that there is any typical African hair type.\n\nBeyond that I’m not quite sure what you are asking. \n\nDo you want to know why people of African descent have evolved to have that hair type?\n\nOr do you want to know what makes hair grow in that fashion? \n\nThe first question entails a very complicated answer. The first I assume you are asking why many  African Americans, who are mostly of West African Negro descent, have a common curly hair type. But even that is somewhat misleading because people who have lived in northern Europe for millennia also have the same hair type occasionally, it’s just rarer there.\n\nAs for why that hair type, the answer probably lies in our ancestry. Humans evolved in Africa and spread out from there to cover the rest of the world. The first humans are assumed to have had hair similar to the modern San and Hottentot groups. That is tightly curled coarse hair, but hair of determinate growth. In some ways San hair is more like pubic hair or many types of beard in that it grows for relatively short periods of time before it falls out. As a result the hair always stays short. That make sit very easy to manage. For our first human ancestors that was probably advantageous since it reduced the opportunity for parasites like lice to take hold and made it very easy to manage since it never requires cutting.\n\nLater humans, still confined to Africa, developed head hair of the same basic tightly curled type, but of indeterminate growth. What that means is that it will keep growing for months or years before it falls out. As a result the hair needs to be trimmed or it will grow into an ‘Afro’ or dreadlocks. Exactly why this change from short to long hair occurs is a mystery, but it was probably simply because people find long hair sexually attractive. \n\nAfter a few people moved out of sub-Saharan Africa a hair type developed which was less tightly curled leading to wavy or even straight hair. Once again there is no sensible reason why this occurred, though it has been speculated that the fact that straight hair becomes greasy may have aided in cold tolerance or may have assisted in parasite control in climates where the head was covered with clothing.\n\nSo in short African Americans commonly retain the ‘second’ type of human hair, being long and tightly curled. Many other people have a third hair type that \n\nAs for why African-American hair grows in that manner, it’s largely genetic. Hair is produced from hair follicles, which almost ‘squeeze’ the hair out of a hole in the skin like tooth paste being squeezed out of a tube. In people with straight hair the hole is round and so the hair is round. People with curly hair have flattened holes and the hair i