Caleb has just experienced his first ejaculation. If he is typical of most boys, how old is he?

Watson is to behaviorism as _______ is to psychoanalysis

a. Freud b. James c. Skinner d. Wundt

Research suggests that the umami receptors may have evolved to allow a preference for

a. sugars. b. acids. c. alkaloids. d. sodium chloride. e. glutamate.