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India has a huge population encompassing many obvious physical variations, from light skins to some of the darkest in the world and a wide variety of hair textures and facial features. Such variations there, as elsewhere, are a product of natural selection in tropical and semitropical environments, of genetic drift among small populations, and of historical migrations and contact between peoples. The Hindu sociocultural system was traditionally divided into castes that were exclusive, hereditary, and endogamous. They were also ranked and unequal and thus appeared to have many of the characteristics of “race.” But the complex caste system was not ...(100 of 15129 words)