LSD and marijuana are classified as ______

A person who is compelled to continue drug taking, despite adverse consequences, is said to suffer from

a. addiction. b. psychic dependence. c. tolerance. d. physical dependence. e. euphoria.

What motivational theory relies heavily on the concept of homeostasis?

a. instinctual theory b. need for affiliation theory c. drive-reduction theory d. need for achievement theory