Which variable may be a factor in the differences between girls' and boys' intellectual capabilities?

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All of the answers are plausible factors that could contribute to differences between girls' and boys' intellectual capabilities. Societal messages regarding gender roles and expectations may influence the domains in which girls and boys feel encouraged or discouraged to excel. Biological differences between the sexes, including differences in brain development, may also play a role in determining intellectual strengths and weaknesses. Finally, peer socialization and exposure to different learning experiences could influence whether and how girls and boys develop their cognitive abilities.

Which Variable May Be a Factor in the Differences Between