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and chimpanzees had a genetic split at least a million years later. One theory suggests that the human and chimpanzee lineages diverged somewhat at first, then some populations interbred around one million years after diverging.

Anatomy

The brains of most species of Australopithecus were roughly 35% of the size of a modern human brain with an endocranial volume average of 466 cc. Although this is more than the average endocranial volume of chimpanzee brains

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