Among other things, hair plays a very important social role in human life. They can have different colors, shapes, lengths, curvatures across different ethnicities. Hair is biologically almost identical to fur in animals. But people do not have hair on most of their body or do not have in distinct quantities. Why on the head we have it and why in such quantities?
There are several reasons for fur in nature. The main reason is thermoregulation, both in winter and in summer. This fact also applies to humans. The fur also protects against the negative effects of UV radiation. Eyelashes protect the eye against water, sweat and dust.
Experts dealing with the question "Why does a person have hair concentrated mainly in one place?" adjusted the question to "Why did a person lose hair on most of his body?" We do not know a clear answer to this question, however, the most widespread theory is that the reason is to get rid of parasites inhabiting the fur of animals and thus reduce the diseases they transmit. Thus, it appears that the hair on the head remained mainly because it protects against UV radiation and because soaked in water cools the body.