Final answer:
Children's play is influenced by both biological and environmental factors. Biological influences can be observed through sex differences in brain structure and hormone activities, while environmental influences are evidenced by the availability and approval of gender-typed toys and activities. Parents' positive feedback also shapes children's play preferences.
Step-by-step explanation:
Children's play is influenced by gender roles that are shaped by both biological and environmental factors. Evidence of biological influences includes research on sex differences in brain structure and hormonal activities. For example, males are found to have more aggressive tendencies influenced by hormonal activities, while females are often associated with better language skills. On the other hand, environmental influences on children's gender-typed behaviors can be observed through the availability and approval/disapproval of toys and activities. For instance, boys are typically given toys that promote motor skills and aggression, while girls are often given toys that foster nurturing and role play. Parents' positive feedback and encouragement for gender-normative behavior also play a role in shaping children's play preferences.