Traditional Racial Classification Assumed That Biological Characteristics Such as Skin

Traditional racial classification assumed that biological characteristics such as skin color were determined by heredity and remained stable over many generations. We now know that

A) skin color is determined by a single gene that is prone to mutations over many generations.
B) skin color is determined by sun exposure and the amount of melanin in our diets.
C) a biological similarity such as skin color is always the result of both common ancestry and natural selection.
D) skin color is actually determined throughout child development.
E) a biological similarity such as skin color is also the result of natural selection working among different populations that face similar environmental challenges.

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