You know, like different breeds of dog.
Any two given people have about a 14% genetic difference between them, while the genes that determine racial characteristics account for 6%. Biologically speaking there is a greater deal of genetic variation among individual races than between them. As Richard Dawkins pointed out, if we were to lose all but one "race" in a major catastrophe (or if all races started interbreeding) there would still be the same amount of genetic variation as there always was in the human species. There is after all a far greater genetic pool of variation for evolution to work with than just simply "race".
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