While Dark Skin Pigmentation Has Enjoyed a Selective Advantage in the Tropics,the

While dark skin pigmentation has enjoyed a selective advantage in the tropics,the opposite is true in northern latitudes,where skins have generally been lightly pigmented.This light pigmentation enables the weak ultraviolet radiation of northern latitudes to penetrate the skin and stimulate formation of:

A) melanin.
B) niacin.
C) vitamin B.
D) vitamin D.
E) vitamin E.

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