The fact that IQ scores for identical twins raised apart are very similar provides evidence for the influence of which of the following upon intelligence?

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The fact that IQ scores for identical twins raised apart are very similar suggests that heredity plays a significant role in intelligence. If environmental factors were the main influence, we would expect greater variability in IQ scores between identical twins raised apart. While environmental factors certainly play a role in shaping intelligence, this evidence suggests that genetic factors are a primary influence.

The Fact That IQ Scores for Identical Twins Raised Apart