Genetic fitness isn't unimportant to women. When are women most likely to demonstrate a preference for males who have symmetrical faces, a muscular physique, and a masculine face?

If the EEG record reveals evidence of sleep spindles, you are likely to conclude that the sleeping person is in which stage of sleep?

a. REM b. Stage 1 c. Stage 2 d. Stage 4 e. Stage 5

Sexual activity among American teens

A) has been greatly reduced by the popularity of virginity pledges. B) is much higher than in Western Europe. C) has become the norm. D) occurs mostly in poorer, less educated neighborhoods.