One drawback of longitudinal research is that subjects who are willing to be tested and retested often have lower-than-average IQs

Which theorist proposed that we go through several psychosocial stages on our way through the lifespan?

a) Erik Erikson b) James Marcia c) Lawrence Kohlberg d) Carol Gilligan

According to statistics reported in the text, what percentage of U. S. teenagers have used alcohol by the end of high school?

a. 30% b. 55% c. 70% d. 92%