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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 :

Adoption studies reveal that there are several interesting findings related to IQ.

Firstly, adopted children tend to show a significant decline in IQ across middle childhood and adolescence, regardless of their rearing conditions. This suggests that genetic factors play a significant role in determining intelligence.

Secondly, it has been found that children of low-IQ biological mothers can perform as well as children with high-IQ biological mothers when placed in similar adoptive homes. This implies that environmental factors may not be as influential as genetics when it comes to determining IQ.

Thirdly, research has shown that genetic factors play a much greater role in determining IQ than environmental factors. This is supported by the fact that adopted children tend to have IQ scores that are more similar to their biological parents than their adoptive parents.

Finally, when children of low-IQ mothers are adopted at birth by parents who are well above average in income and education, they tend to score above average in IQ during the school years. This suggests that a supportive and stimulating environment can enhance cognitive development and potentially offset genetic predispositions towards lower IQ.
Adoption studies reveal that 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. This suggests that environmental factors, such as access to resources and educational opportunities, can significantly influence a child's intellectual development.

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