In Scarr's dynamic model of gene-environment interactions, the finding that biologically-unrelated siblings raised in the same home grow increasingly dissimilar with age can be explained by the concept of

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Niche-picking refers to the process by which individuals select environments that complement their genetic predispositions. In Scarr's dynamic model, as children grow older, they have more freedom to choose their own environments and activities, leading to increased dissimilarity among non-biologically related siblings who share the same home environment but have different genetic predispositions.

In Scarr's Dynamic Model of Gene-Environment Interactions, the Finding That