Alternate to what? I don't see anyone else having posited a causal explanation at all?
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Here's the causal explanation - there were different returns to intelligence in the ancestral environments of the different human species (as different genetically as wolves and coyotes). The human species from Africa have smaller brains and less intelligence.
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It doesn't hinge on the first. The second is proven in studies that replicate (and beyond that brain tissue is expensive so different v^3 prove different selective pressures). 3rd is you being amazingly stupid: "The theory of genetic inheritance hinges on Mendel's observations"
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Stop saying really stupid things and people will stop pointing out how you're saying stupid things. Saying that proof of the existence of brain size differences relies on Morton's work is like saying that proof of the circumference of the Earth relies on Eratosthenes' work.
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