Because some individuals or human groups, such as the Arapesh, the Senoi, the Navajo, and the Eskimo, show little hostility or aggression casts doubt on which viewpoint of aggression?

The evidence indicates that there is no increased risk of injury associated with the practice of drinking mixtures of alcohol and energy drinks

a. true b. false

Which of the following explains why, after staring at a light bulb, we tend to see a shadow floating in front of our vision when we look away?

a) the opponent-process theory b) the trichromatic theory c) the signal-detection theory d) the gate control theory