A set of characteristics believed to be shared by all members of a social category is a ______

The founder of Gestalt psychology and pioneer of insight problem solving was:

a. Thorndike. b. Terman. c. Kohler. d. Harlow.

What is the term used to define substances that adolescents may try before they may go on to try "harder" substances?

a. Gateway drugs b. Safeway drugs c. Waystation drugs d. Weightgain drugs