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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You need to finish that thought because that's a non sequitur - your implied conclusion doesn't follow. The conclusion you want is "therefore the between group variation is insignificant" which doesn't follow. "There is more variation in height within sexes than between them"
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Wrong and a 2 second of search on google scholar would have confirmed it.
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