According to Piaget, what is the child's "work":

Unpredictability is stressful because:

a. we don't know when "uplifts" will occur. b. we must expect too much control. c. we cannot plan for random events. d. hassles cancel good effects of "uplifts."

According to cognitive-developmental theory, gender constancy is usually acquired by age

a. 2 or 3 b. 4 or 5 c. 6 or 7 d. 8 or 9