On average, how many words does an 18-month-old toddler know?

Paternal involvement with children in dual-earner households is associated with

A) low self-esteem and high school dropout in girls but not boys. B) high levels of competitive, aggressive behavior in school. C) high intelligence and achievement and gender-stereotype flexibility in adolescence. D) average intelligence, athletic competence, and gender typicality in adolescence.

B. F. Skinner made major contributions to

a. structuralism. c. behaviorism. b. functionalism. d. Gestalt psychology.