Tim can't believe he has outgrown his tennis shoes again. This is the second pair he has outgrown in the past six months. What is Tim most likely experiencing?

Genetic changes have been found in groups experiencing low socioeconomic status and posttraumatic stress disorder. These finding illustrate:

a. Selye's model. b. the tend and befriend model. c. environment-gene interactions. d. a stimulus-oriented viewpoint.

Classical conditioning plays an important role in which of the following?

A) Intrinsic and extrinsic reinforcements for learning B) The development of social skills such as courtesy and patience C) The development of emotional responses such as anxiety or embarrassment D) Differentiated and effective strategies for problem-solving and negotiating a complex environment