Which biological factor is most likely to affect sex-role typing?

Question

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Hormones, particularly sex hormones such as testosterone and estrogen, play a major role in shaping the development of sex characteristics and gender identity. Hormones can influence behavior, interests, and preferences that are typically associated with male or female gender roles. For example, high levels of testosterone have been linked to more aggressive and competitive behaviors in males, while estrogen has been linked to nurturing and caring behaviors in females.

Which Biological Factor Is Most Likely to Affect Sex-Role Typing