False smiles last 10 seconds or more, whereas authentic smiles last only about 2 seconds

Aggression is defined as behavior where the purpose is to:

A) use physical violence. B) impulsively take something from another person. C) harm another. D) take premeditated action to achieve a goal.

Scientists have long known that body activity is guided by internal "biological clocks" known as

a. biofeedback. b. stimulus motives. c. circadian rhythms. d. homeostatic equilibrium.