Children in the stage of concrete operations have typically mastered what Piaget called "conservation."

Which of the following statements about cliques is FALSE?

A) Clique membership changes frequently. B) Most adolescents do not belong to a clique. C) Cliques usually have a very definite status hierarchy. D) Liaisons become less and less common as adolescents get older.

People with schizophrenia may have difficulty with the form of thought - in other words, their thoughts do not make sense. The observable sign of this is

a. a delusion. b. a hallucination. c. disorganized speech. d. disorganized behavior.