Ego is to Freud as _________ is (are) to sociobiology.
a. genes
b. survival of the fittest
c. the cortex of the brain
d. reciprocal altruism
Question 2
A cross-sectional study found that the typical 65-year-old is more self-disciplined than __________ of early adolescents.
a. 55
b. 85
c. 95
d. 100