extremphiles

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Title: extremphiles

Essay Details:

Subject: American History

Author: Irene L

Date: October 8, 2010

Level: University

Grade: B

Length: 2 / 345

Essay text:

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. 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. Vitamin D is essential for human life, and the only mineral in the human body not gained through ingestion...

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