Which is a common criticism of twin studies?

Question

Quizplus · Accepted Answer

One common criticism of twin studies is that environmental similarity, rather than genetic similarity, may be responsible for the similarities seen in twins. This is because some identical twins may be treated differently, while some fraternal twins may have very similar environments. Therefore, it can be difficult to disentangle the effects of nature versus nurture in twin studies, and some researchers argue that other methods should be used to study genetic and environmental influences on behavior and development.

Which Is a Common Criticism of Twin Studies