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> Previous studies demonstrating high heritability of IQ did not discriminate between genetic inheritance and social/cultural/environmental inheritance.

This simply isn't true. Studies of twins not raised together provide evidence that IQ is more than 50% heritable. https://onlinelibrary.wiley.com/doi/epdf/10.1002/neu.10160

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Heritability is not only genetic, it includes a wide variety of social factors.

Strict genetic heritability studies do not support a stong association of genetics with intelligence.

I'm curious to hear what exactly you think "twins not raised together" means.

The pre-natal environment is shared, and depending on the adoption process there could be a great deal of correlation in a range of environmental factors. It's not like these kids are grown in a vat and distributed randomly in the population is it?

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