Why do similarities in the IQ of raised-together siblings tend to disappear as the children grow older?

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Why do similarities in the IQ of raised-together siblings tend to disappear as the children grow older?

As children mature and become increasingly autonomous they each tend to create a unique environment

The genes that differentiate intellectual abilities are dormant until the appraoch of puberty

ALL of these

Sibling learn to over-compensate for deficiencies in each other's abilities