A very strong cultural norm dictates that males are expected to be tough whereas females are expected to be more gentle and kind. This aggression norm is cited in your text as evidence that

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The fact that there is a cultural norm for males to be tough and aggressive and females to be gentle and kind suggests that biology and culture interact to develop gender-role norms. It is not solely influenced by biology, as cultural factors also play a significant role in shaping gender roles. This norm is not completely arbitrary, as it is a deeply ingrained cultural value, but it does demonstrate that what may be biologically "fit" does not always align with what is culturally desirable.

A Very Strong Cultural Norm Dictates That Males Are Expected