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What evolutionary forces could have led to the pattern of human hair distribution?

What evolutionary forces could have led to the pattern of human hair distribution and why is there such a big difference in growth rate between head and body hair?
Stella Ball from Norfolk (Age 55+)

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One Response

  1. People have head hair that grows much longer than other hair precisely because this sort of growth pattern literally forces us to do something with our hair (otherwise it becomes tangled, dirty, and generally inconvenient).

    In so doing, hair becomes, in effect, a mandatory communication tool. You can tell, from a person’s hair, their ethnic origin, age, and often their social affiliations. And unkempt hair, which is a pain to have, tells you something important about a person’s state of mind, and fitness.

    In all, it’s a highly useful, mandatory substrate for conveying key social information. Given that humans are the most social of primates, and probably of all mammals, it’s no shock that hair would have evolved in such a way.

    See http://goerwitz.name/drupal/node/143

    RG

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