How many "best" friends might the typical 9-year-old have?

In evolutionary psychology, which of the following would be a good description of natural selection?

A. Successful genetically determined adaptations become more common over successive generations. B. Successful genetically determined adaptations become less common over successive generations. C. Unsuccessful genetically determined adaptations become more common over successive generations. D. Successful genetically determined adaptations become more common in many other species.

While women are generally shorter and less muscular than men, there is good news! Which of the following statements has been supported by research findings?

a. Women, on average, have larger parietal lobes in their brains than men. b. Women, on average, are better at puzzles of spatial skill than men. c. Women, on average, have more muscle and less fat than men. d. Women, on average, live 5 years longer than men.