Approximately what percent of American undergraduates have been involved in a friends-with-benefits relationship?

Carl worries a great deal about how other people think about him. He will likely score high on the _____________ scale of a Five-Factor Model

a. Neuroticism b. Openness c. Extraversion d. Conscientiousness

Some cross-racial helping is not truly altruistic because it can be a sign of

a. kin selection. b. utility. c. self-support for the helper. d. feelings of superiority over the person being helped.