In fact, a full understanding of human sex differences requires that we begin with a consideration of the evolution of sexual reproduction itself. After several generations, the average beak size of medium ground finches was now smaller than it was just after the drought--the distribution had shifted back to the left!
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The dynamics of sexual selection are much more complication for species--which includes humans--where males show some level of direct parental investment. Nonetheless, the advantage of girls and women in reading achievement might be indirectly related to more primary, that is, evolved, cognitive sex differences.
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Access to high-quality food has important reproductive consequences for these females and their offspring, as females who have access to this food are larger, healthier and have more surviving offspring than their undernourished peers. As a result, the reproductive effort of males tends to be largely focused on mating effort and the associated male-male competition and the reproductive effort of females tends to be largely focused on parental effort and the associated female choice e.
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