Question

Adoption studies reveal that
A) adopted children show a significant decline in IQ across middle childhood and adolescence, regardless of rearing conditions.
B) children of low-IQ biological mothers do as well as children with high-IQ biological mothers when placed in similar adoptive homes.
C) genetic factors play a much greater role in IQ than environmental factors.
D) when children of low-IQ mothers are adopted at birth by parents who are well above average in income and education, they score above average in IQ during the school years.

Answer

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