Fur, like feathers, is a very good temperature regulator. In cold weather, it captures the warmth of your body near your body; in hot weather, it may loosen slightly or swell up a bit and allow your body to warm to the environment. In addition, fur (or noticeable hairy coating) is an excellent protection against ultraviolet (UV) radiation. UV rays, as we know, can cause sunburn, painful sunburn and extremely skin cancer. On the balance, wool has a positive evolutionary value of survival, as evidenced by a large number of mammals that have a natural fur coat.
Although not all types of mammals wear a natural fur coat, our primordial ancestors, past and present, did and did. Since humans are their natural descendants, it would be logical to expect that Homo sapiens will also have a natural fur coat. We are not. Where did our fur coat disappear?
Any age of mammals. or the text of physical anthropology will show our humanoid ancestors (for example, Australopithecus from about 3.2 million years ago) as rather hairy creatures that we once were, even when we were on the evolutionary path to modern man today. Somewhere between now we lost our fur, but our primary relationship (these 193 species of chimpanzees, gorillas, monkeys, etc.) did not, but we shared the same environmental path through Africa with many of these furry primates. Why one (we, the people), and not many (their primates) have lost and respectfully kept their hairiness, is the number one secret.
People have little sense in losing pleasure, migrating to a cooler climate, and then inventing clothes when the original fur coat serves the same purpose. This is mystery number two. To reinvent clothing, it carries a whole range of other necessary skills and technologies that need to be discarded, studied and transmitted in a generation, such as skinning, and cured and sewed, create themes, the concept of buttons and straps, and the ability to tie knots. All this is not necessary, if we only saved our fur. We have primitive cousins who survive and thrive in a cold, even snowy climate, only with the benefit of fur.
Now one of the reasons why we lost our hairiness may be that we have developed sweat glands to save us from unwanted heat. However, sweating in hot, humid weather would create because of the fur coat, so the furs. However, wool is a good temperature. So why, if the sweat glands are so excellent, didn't other primates develop sweet glands? [Actually, like cats and dogs, primates can sort of 'sweat' and lose heat through the non-hairy parts of their body, like the pads on their feet / hands, their naked noses or via panting.]
So why did we sell our birth coat for the sweat glands, which, by the way, is just a cooling mechanism and not very effective in wet conditions (“it's not warm, but humidity”) and even more forced to invent a completely unnatural concept of clothing that no other types of animals do not use?
Another possible reason we lost our fur is because we are big. Large animals have great difficulty in getting rid of the body heat of relatively small animals. As the volume of the body increases, the volume (which produces heat) increases faster than the surface area of the body from which heat is released. Sometimes what really big animals, such as cattle, horses and elephants, less hairy than cats, rats and mice.
However, while humans are large relative to many primates, some primates are coarse and fuzzy in our sizes, so not all of them finish all explanations. We should be about the size that will be covered with fur, as many other mammals are about our size, even larger (for example, bears or lions) are covered with fur.
Of course, even very large mammals living in extremely cold climates still need fur, for example, your cold mammoths. Speaking of the Ice Age, they had to provide an evolutionary impetus for us to get hold of our fluffy cover again, but, oddly enough, we did not. This reminds me; fur is a good insulator and snow protector - snow on fur is not important; Snow on the skin - let's talk well about cooling. And the fur also offers some protection against wind cooling. Cold is one thing; cold, when the wind blows, really feels cold and can deprive you of body heat quickly clever.
Speaking of large hairy animals, in particular potential primates, it is often reported (never was) Sasquatch, Big Foot, Yeti, Yowie (and many other cryptozoological bipedal hominoids reported from around the world). If these atrocities do exist, and many people, even scientists, give more than just some certainty, the most likely candidate is the now not so extinct giant humanoid monkey Gigantopithecus (traditionally it is believed that it exists only 1 million to 300,000 years ago). One of the characteristics of modern observations, originating from anywhere in the world, is a monkey-like creature, covered with a multitude of fur. Thus, Sasquatch (if it exists) corresponds to us, being a two-legged, but has retained its fur. We are still odd.
Of course, you can appeal that we have not lost all of our heavy fur coverage - we have a head, full hair (or, at least, most of us). Maybe our hair should keep the brain warm, but it's not very convenient to have a warm brain when the rest of the body is experiencing hyperthermia. In any case, there seems to be a critical difference between our head (and facial) hair and real fur. The difference is that we need haircuts, because hair growth does not know when to quit smoking! We all saw women with hair length up to their waist; with a beard a bird could build a nest. If such uncontrolled hair growth occurred in the natural world, it might look, but it would not be at all comical. Extrapolate a woman's belt-length hair for your beloved cat or dog, and your pet (or any equivalent wild animal) cannot function. I mean, we all heard shaggy tales about dogs, but not so shaggy!
Of course, there are other ways to control the temperature than fur. You can warm yourself in the sun; cool in the shade, regardless of skin or fur, but at night it’s all a shadow, and if it’s already cold, and you’re naked on your skin, then you can’t make temperature adjustment much more than a shiver.
In addition to the issues of heat regulation, fur colors and patterns are useful in camouflage. Some mammals even change their fur color over the years - for example, in the winter winter a white fur coat. Soldiers, on the other hand, must wear ready-made brushstrokes, losing all the natural fluffy camouflage they once had.
In conclusion, the question is whether we have lost our fur, because we have developed sweat glands, or we had to develop sweat glands, because we have lost our fur, fur, which again seems to provide excellent means of heat control, like do we celebrate in our cats and dogs and many other mammals? Translated, there were no real environmental reasons to lose our fur if we didn’t find the sweat glands, but then we’ll go back to the question of why our primate-cousin kisses didn’t develop the sweat glands, if they provide a more efficient way to lose the heat not scored (remember humidity). And it gives no explanation for keeping warm; the ability that we have lost without fur, and to demand the invention of the clothing industry as a replacement.
I do not know the answer to the question why we lost our fur; this is certainly a first order biological anomaly. However, I need to emphasize the word "monkey" in this bare monkey. Desmond Morris's phrase does not attribute this puzzle to anyone, saying that this is all due to the fact that man (and woman) is created in the image of God. This is the only thing that can be associated with God. be extraterrestrial IMHO flesh and blood. To meet my point of view that people were created in the image of ET through genetic engineering and artificial selection, well, maybe ET wanted a naked monkey as a subject, not a walking, hairy carpet talking!
