The fact that IQ correlations increase with age for identical twins, but decrease with age for fraternal twins, suggests that
A) the genetic likeness of identical twins causes them to seek out similar niches in adolescence and adulthood.
B) the influence of rearing conditions on IQ is stronger for identical twins than fraternal twins.
C) rearing experiences play a larger role early in life, whereas genetic influences play a larger role later in life.
D) the contribution of heredity to IQ decreases with age.
A
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What were the results of this study?
(a) the group that had been assigned player names wanted less than they had paid to give up the name (b) the group that had selected player names wanted about as much to give up the name as the group that had been assigned the name (c) the group that had selected player names wanted more than four times as much to give up the name as the group that had been assigned the name (d) none of the above
Which of the following best describes the change in the prevalence rate of heroin use in recent years?
a) The prevalence rate of heroin has increased primarily among the urban poor. b) The prevalence rate of heroin has increased primarily among well-educated people. c) The prevalence rate of heroin has decreased primarily among women. d) The prevalence rate of heroin has decreased dramatically across most groups.