Adoption Studies Consistently Reveal That

Multiple Choice

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.