The peaks of the sound wave are referred to as

According to Piaget, more advanced mental structures would not develop without

a. reinforcement. c. imitation. b. short-term storage space. d. disequilibrium.

Which of the following is true of adolescents who become close friends?

A) They tend to have different educational aspirations. B) They tend to share similar attitudes. C) They do not tend to have the same religious and political orientations. D) They have different patterns of drinking, drug use, and delinquency.