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Africans tend to have heavy jaws and exhibit prognathism, which means their jaws protrude forward. This is considered a primitive trait left over from when our most effective weapon was our teeth, which, in order to be effective, had to be able to cut a swath that extended out in front of the face. Apes, for example, have extended jaws that let them meet an enemy with their teeth rather than their faces.

*I don't endorse hate, this is purely scientific measures