According to the text, which theory of sleep does the best job of explaining why there are such large differences in the amount of time that the members of various mammalian species spend sleeping?
A) recuperative theory
B) Freudian theory
C) adaptation theory
D) activation-synthesis theory
E) sandman theory
Answer: C
Psychology
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Dr. O'Donnell studies why children play in gender-segregated groups and how such play might lead to adult gender-typed behaviors. Dr. O'Donnell's research is in the realm of
A) cognitive psychology. B) ecological systems theory. C) sociocultural theory. D) evolutionary developmental psychology.
Psychology
Overall, about _____ percent of U.S. preschoolers lack essential immunizations
A) 10 B) 20 C) 30 D) 40
Psychology