And since the tests are constructed by people from a narrow social class, this is another reason why lower class people score lower, along with stress etc, which lower class people are more likely to be. It's a good hypothesis, better than inventing a biological/physiological
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So then if intelligence is useful in an evolutionary sense then variation in intelligence will be selected against since natural selection lowers genetic variation in traits important for survival. It
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Intelligence is also costly and has different value in different environments. Strength is obviously a good trait for survival, too, but there's plenty of variation in it.
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How does it have different value in different environments? The point of bringing up genetic variation is the sky-high heritability of IQ which is due to the flawed twin method. Controlled breeding studies don't show any heritability estimates that high for animals
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Therefore it's the method we use to find the heritability that's flawed. Intelligence should have a low variation since it's a trait important for survival. See Ronald Fisher and others who have corroborated this.
End of conversation
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