A police officer pulls over a driver suspected of driving under the influence of alcohol. The driver is asked to exit the car and walk a straight line. This test is designed to detect the effects of alcohol on the

About ______ of the variation in age of puberty is determined by genes

one-half two-thirds one-fourth three-fourths

A famed psychologist claims that motivated behaviors result from an effort to reduce tension caused by bodily needs such as hunger or thirst. This psychologist's approach most closely matches ______ theory

a) incentive b) homeostatic c) instinct d) drive-reduction