Answer:
that intelligence has a genetic component.
Step-by-step explanation:
1. IQ scores of adopted twins have found that identical twins are more like one another in IQ than fraternal twins
The difference between identical twins and fraternal twins are their genetic composition.
Identical twins shares the exact same genetic composition. While fraternal twins share the same womb before they're born, they do not share the same genetic composition. The fact that IQ scores of adopted twins have found that identical twins are more alike indicates that Genetic composition played a big role In IQ.
2. IQs of adopted children are more strongly correlated with the IQs of their biological parents than with the IQs of their adoptive parents.
From this research result we can determine which one the bigger influence of IQ development. (between genetic or environment)
The fact that .IQs of adopted children are more strongly correlated with the IQs of their biological parent indicates that Genetic played a bigger role in IQ development compared to environment where people were raised.