_____ reinforcers help satisfy biological needs.

In psychoanalysis, the part of the personality that represents reason, good sense, and rational self-control is called:

a. the libido. b. the ego. c. the superego. d. the id.

Katie and Jon are in the same accounting class, they live in the same wing of their dormitory, and they usually both study at the campus coffeehouse in the morning before class. Over time, Katie and Jon become attracted to each other

What force is most likely at work here? a. complementarity b. propinquity c. reciprocal liking d. similarity