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There were two basic hominid types - Examples like Parathropus and A. robustus were immensely strong and thickly built, either part-time or full-time knuckle walkers that were herbivorous and had massive jaws and molars. Gracile hominids were lighter and faster, better able to hunt animals and move with more physical ease.

Genetic superiority isn't really an applicable term. These different types evolved to cope with their native environments - form following function. There are even examples of 'hobbit' fossils found on a tiny Indonesian island - another instance of environmental adaptation - and this is consistent with the evolutionary process in other, non-human species -

A black person's darker skin is a regional adaptation. While it's true that dark colors absorb more heat the additional pigment also protects from skin cancer. Polar bears have white fur, but black skin for this very reason due to the effects of solar radiation close to the magnetic North Pole.