volume is around in men and in women, although there is substantial individual variation. Yet another study found that adult human brain weight is 1300-1400 g for adult humans and 350-400 g for newborn humans. There is a range of volume and weights, and not just one number that one can definitively rely on. Variation between humans of similar age is smaller than that between species. The mechanisms of interspecific and intraspecific variation also differ.

Variation and evolution

From early primates to hominids and

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