There are studies of twins raised separately that directly address this. We know a great deal about the genetic heritability of IQ, please have a look at this f

There are studies of twins raised separately that directly address this. We know a great deal about the genetic heritability of IQ, please have a look at this for more info: https://en.wikipedia.org/wiki/Heritability_of_IQ https://en.wikipedia.org/wiki/Heritability_of_IQ Extreme skepticism of social science findings is warranted for some subfields, but when it comes to intelligence, humanity has actually learned a lot.