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The human body is smooth and clean, unlike most mammals covered with long hair, but the ancestors of human - apes, whose body is covered with thick long hair. There has been hairy child, and his whole body covered with thick long hair, but intelligence is no different from ordinary people, scientists attributed it to human atavism. However, why the human body is not covered with long hair? Under what circumstances did human take off their long hair? There are many explanations for these doubts. One theory is that the human ancient ancestors in the evolutionary process, for health and other reasons, they make thick hair degradation out. Because thick hair is the place of parasites breeding, after human ancestors learned to hunt, it is easier to make fur dirty. It was observed that a vulture eating animal carcasses often have to put its head in the animal's body, so the head is often covered with the blood of animals. Over time, the vulture head feathers are unsanitary. So, in the long-term process of biological evolution, the vulture head feathers gradually faded. Weill, the human’s body hair also for the same reason, like the feathers of the vulture’s head faded. However, it was also expressed objection: for hygienic reasons, why the chimpanzee’s body surface is covered with a thick body hair? So some people put forward, thick body hair is used to keep out the cold. When human learn to use fire, it seems that you do not need to use body hair to keep warm, and fur appears superfluous. So, when human learned to use fire, the fur for keeping warm gradually shed, becoming smooth skin, only with fine hair. However, to prove this point, the evidence is still not sufficient. Moreover, another theory is that people need long-distance running in the process of hunting, and in the way, people will be sweating on the run. However, the body covered with long hair is very not conductive to body heat, and also from a certain amount of resistance, make people run not fast. But when their long hair fades, they will naturally have more sweat, which is better to conduct heat dissipation. Furthermore, if people lose their long hair, in the cold evening, they are unable to resist the cold, so they produce a thick layer of fat under the skin, which is used to ward off the cold. In the face of this problem, there are still many other statements, but I think it is an interesting issue. Most players play online games for fun and they almost play every day. So the gold is used up soon, they have to buy in Guild Wars 2 Gold, Guild Wars 2 Gold and Guild Wars 2 Gold Sale.
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