The __________ system is a part of the brain that stimulates approach behavior in response to the anticipation of a reward

In the Big Five, each factor represents:

a. one or two "subtraits" b. an unconscious construct that cannot be measured c. a dichotomy d. a continuum of behavior

What is the first and shortest stage of the prenatal period called?

A. fertilization stage B. germinal stage C. conception stage D. embryonic stage