What finding from the National Longitudinal Survey of Youth seems critical in explaining past reports of a relation involving birth order, family size, and intelligence?
a) Average IQ performance since the 1930s has risen.
b) Parents with lower IQs tend to have more children than the national average.
c) The education of children is related to the diet of the mother during pregnancy.
d) Larger families are more likely to have twins who are more likely to have similar IQs.
B
Psychology
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