The most widely used and researched of all personality inventories is the MMPI

Eysenck used data from _________ to support his claim for biological differences in his three superfactors

a. rats b. human twins c. huge populations in several countries d. the Human Genome Project

Research shows that __________ is an important time for the acquisition of a sense of responsibility

a) early childhood b) middle childhood c) adolescence d) emerging adulthood