IQs of Americans have gone up about __________ point(s) per decade since 1940

Twins who are genetically identical are known as ___________ twins

a. dizygotic c. dominant b. monozygotic d. recessive

According to Skinner, the idea that personality traits influence behavior is

A) not scientific. B) probably true. C) a fundamental assumption of his theory. D) demonstrated by a functional analysis.