Answer:The world-wide distribution of human skin color is highly correlated with the intensity of incident UV radiation. Thus, in places where the irradiation is very high, darker colors have been favoured, while at higher latitudes, where the irradiation is lower, lighter skins are predominant As populations migrated away from the tropics into areas of low UV radiation, they developed light skin pigmentation as an evolutionary selection acting against vitamin D depletion.
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