The observation that the incidence of obesity has greatly increased over a few decades is unlikely to be due to
a. some innate aberration of metabolism.
b. increased exercise awareness of our citizens.
c. rapid changes in the gene pool.
d. smaller portions provided by fast-food restaurants.
e. the fact that we require fewer calories as we get older.
Answer: c. rapid changes in the gene pool.
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A method of studying developmental changes by reconstructing subjects' pasts, through interviews and investigating the effects of events that occurred in the past on current behaviors is called a ______ study
a. longitudinal c. naturalistic observation b. cross-sectional d. biographical
In terms of collecting data on adolescent sexual behavior, most researchers have documented
that: A) their responses may be consistent over time, but not necessarily valid. B) most parents and adolescents approve of such research so as to better society. C) there is little one can do to encourage honest responding. D) adolescents that currently report high rates of sexual activity are more likely to experience unintended pregnancies in the future.