Adoption studies consistently reveal that
A) about three-quarters of the differences in IQ among children can be traced to their genetic makeup.
B) when young children are adopted into caring, stimulating homes, their IQs rise substantially.
C) adopted children of low-IQ biological mothers score below average on IQ tests during the school years.
D) adopted children score, on average, 15 to 20 points lower in IQ than their nonadopted agemates.

Question

Quizplus · Accepted Answer

Adoption studies show that environmental factors, such as being raised in a caring and stimulating home, can have a significant positive impact on a child's IQ. This supports the idea that while genetics play a role in intelligence, environmental factors are also crucial in intellectual development.

Adoption Studies Consistently Reveal That