In the quest for a love relationship, the old adage that opposites attract doesn't hold true. In reality, people tend to choose partners based on how similar they are to each other. Formally, this is known as

Research on social factors and the risk of posttraumatic stress disorder suggests a role of social support in the etiology of posttraumatic stress disorder (PTSD). It was found that veterans

a. who didn't face the embarrassment of being treated as heroes had lower rates of PTSD. b. from units that encouraged independence had lower rates of PTSD. c. who did not receive social support on their return had high rates of PTSD. d. who had high social support through the Veterans Administration still had high rates of PTSD.

The importance of inherited behavioral traits was most clearly highlighted by:

a. John Locke. b. Darwin. c. Watson. d. B. F. Skinner.