A finding that siblings reared together are more similar in intelligence than are half-siblings (individuals who share one parent) reared together would be evidence for:

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The finding that siblings reared together are more similar in intelligence than half-siblings reared together suggests that genetic factors are more important than environmental factors in determining intelligence. The fact that they share more genes means that they are more likely to have similar levels of intelligence, whereas the fact that they share one parent (and therefore have different genes) suggests that environmental factors may play a smaller role.

A Finding That Siblings Reared Together Are More Similar in Intelligence