The correlation between the IQ scores of fraternal twins raised together is lower than IQ scores of

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The correlation between the IQ scores of fraternal twins raised together is lower than IQ scores of identical twins raised together. What conclusion can be drawn from this data?

a. Nothing, because the type of twin has not been held constant.

b. Nothing, because there is no comparison between twins and adopted children.

c. Nothing, because cultural differences have not been considered.

d. There is a genetic effect on intelligence.

e. There is an environmental effect on intelligence.

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