Adoption research has shown that

Question

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Adoption research has shown that children of low-IQ biological mothers scored above average in IQ during the school years when adopted at birth by high-IQ parents. This phenomenon is known as the "Flynn effect," which suggests that environmental factors, such as the quality of the adoptive family, can have a significant impact on a child's IQ. Option A is incorrect because the IQ resemblance between adoptees and their biological mothers remains constant over time. Option B is also incorrect because research has shown that adopted children's IQ is more influenced by their adoptive family rather than their biological family. Option D is incorrect because correlations between the IQ scores of biological relatives are higher than those of adoptive relatives.

Adoption Research Has Shown That