The study by Turkheimer and colleagues (2003) of twins from different socioeconomic status levels found that __________.
A. heritability was higher among low-income children and shared environment among high-income children
B. both heritability and shared environmental factors were higher among high-income children
C. both heritability and shared environmental factors were higher among low-income children
D. heritability was higher among high-income children and shared environment among low-income children
Answer: D
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