According to Bronfenbrenner's bioecological model, your family, friends, and classmates are part of your:

One of the most important protective factors for drug use is

A. having to work for your spending money. B. having been punished for fighting. C. knowing adults who use drugs. D. believing that there are strong sanctions against substance use at school.

The main reason that psychological researchers use the experimental method is to

a. make claims concerning causality. b. eliminate operational definitions. c. suggest possible confounding variables. d. determine whether two variables are related.