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extremphiles
Essay specific features
Written by:
Burton D
Date added:
December 23, 2010
Level:
University
Grade:
A
No of pages / words:
2 / 345
Was viewed:
6220 times
Rating of current essay:
Essay content:
In humans, lighter-skinned people are more susceptible to a deficiency in Vitamin B folate.
It is believed that Africa is the cradle of human health, and the African sun posed a harsh obstacle for human evolution. Humans evolved a dark skin color to protect from the harsh African sun, and the UV rays it produces...
displayed 300 characters
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Humans evolved a dark skin color to protect from the harsh African sun, and the UV rays it produces. It follows that human skin color is a function of the climate, and as people spread out form Africa the more temperate climates was conducive to a lighter skin color. This is because as well as shielding UV rays the melanin also blocks the absorption of vitamin D...
displayed 300 characters
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