Research on sibling relationships in African-American families indicates that these relationships are most positive when children have

a. many siblings

According to Piaget's theory, children develop which of the following abilities at around the time the sensorimotor period ends and the preoperational period begins?

a. picturing the world mentally without taking action b. transferring information in short term memory to long term memory c. generating new strategies to solve problems d. understanding logical reversible operations

When dominance hierarchies form in girls' groups, the girls at the top of the hierarchy

a. are the smartest. b. have the skills that are the most valuable to the group. c. are the most intimidating physically. d. are the friendliest.