Which of the following best describes the toddler's understanding that he or she is defined by membership in various categories, such as gender or personality characteristics?

Standards of psychological health are

(a) absolute (b) relative (c) culturally and politically defined (d) the result of both cultural and biological influences

Best friends, Gabe and Zeke, wrestle, roll, and chase after each other, alternating roles while smiling and laughing. This type of rough-and-tumble play

A) is equally common among boys and girls. B) predicts aggressive behavior during adolescence. C) helps children assess the strength of peers in a safe context. D) is a uniquely human social behavior.