Convincing evidence for the role of environmental influences on intelligence is provided by studies that compare which groups

Question

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Studies that compare adopted children to their adoptive parents provide convincing evidence for the role of environmental influences on intelligence. This is because adopted children share no genes with their adoptive parents, but they share the same environment. Therefore, any similarities in intelligence between the adoptive parent and the adopted child can be attributed to environmental influences. Comparing adopted children to their biological parents (choice B) can also provide evidence for the role of genetic influences, but it does not specifically address environmental influences. The other two options (A and D) involve studying children with their biological parents, which does not allow researchers to separate the effects of nature and nurture on intelligence.

Convincing Evidence for the Role of Environmental Influences on Intelligence