According to Freudian theory, at least in its later form, there are two broad categories of instincts: life instincts called Eros and death instincts called _______

Research suggests that the amount of __________ in the cerebrum is positively correlated with intelligence in humans

a) white matter b) cerebrospinal fluid c) myelin d) gray matter

Compared to children who lack friends, children with good friends

a. have higher self-esteem. c. are more likely to be lonely. b. are more likely to be depressed. d. are less willing to share and cooperate with others.