For our hunter–gatherer ancestors to survive, physical activity was essential. Today, what do children and adults in the United States spend an average of 55% of their day doing?

Dr. Phong is a psychologist who strongly endorses the notion that individuals often display certain behavioral patterns because those patterns have proven to solve specific problems in the survival and mating processes of the human species. Dr. Phong is best described as a(n) _________ psychologist.

a) psychoanalytic b) personality c) evolutionary d) cognitive

Jet lag is typically the worst when traveling

A) north. B) south. C) east. D) west.