Behavioral-genetic studies have shown that as adopted children grow into adulthood,the correlation between their IQ scores and those of their biologically unrelated family members diminishes to zero.

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This statement is true. Studies have shown that as adopted children grow into adulthood, their IQ scores become more similar to those of their adoptive family members, indicating the strong influence of environment on IQ. However, the correlation between their IQ scores and those of their biologically unrelated family members diminishes to zero, indicating the limited role of genetics in determining IQ.

Behavioral-Genetic Studies Have Shown That as Adopted Children Grow into Adulthood,the