Skin Color, Which Has Been Used Extensively in Racial Classifications

Skin color, which has been used extensively in racial classifications, has been shown to be responsive to different environmental factors, making it of little use in categorizing humans into races. Some of the environmental factors that in?fluence skin pigmentation include:

A) the amount of ultraviolet radiation and cold
B) the amount of carbohydrates versus proteins that are in the diet
C) the need for natural camouflage from predators
D) iron and zinc compounds in the soil .

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