________________ were once singled out by social scientists as the only universal norm in the world, but they have since been found not to exist among the ancient Egyptians.

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Incest taboos were once considered a universal norm across all societies by social scientists. However, this notion was challenged by the discovery that ancient Egyptians did not have such taboos, particularly among the royal family, where brother-sister marriages were practiced to maintain the royal bloodline.

________________ Were Once Singled Out by Social Scientists as the Only