According to Scarr and McCartney, what is the main reason that identical twins continue to have similar IQ scores throughout life, whereas the resemblance of IQ scores between fraternal twins decreases with time?
A) Genotype is the primary determinant of IQ.
B) Environment is the primary determinant of IQ.
C) Identical twins actively select more similar environments than do fraternal twins.
D) Genotype determines an individual's environment in both childhood and adulthood.
Correct Answer:
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