The assumption that differences between monozygotic (or identical) twins are caused entirely by genetic factors is called the assumption because such twins are believed to have shared the same womb, were born at the same time, have lived in the same family and community, and are always the same age when tested.

Equal Environment

Explanation:

Based on the information provided within the question the term being mentioned in this question is called the Equal Environment Assumption. Like mentioned in this question it assumes the differences in twins are genetic factors since their environments and it's effects seem to always be the exact same when the twins are tested. Which is why it is an assumption and not a fact or theory.

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can you explain a little further maybe give multiple choice? ?

the answer to your question is,

old stone age.

-mabel < 3