extremphiles

Essay specific features

 

Issue:

American History

 

Written by:

Burton D

 

Date added:

December 23, 2010

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 345

 

Was viewed:

5940 times

 

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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...
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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...
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