the famous case of the genain sisters, identical quadruplets all diagnosed with schizophrenia, points out that siblings raised in the same household may experience their environment very differently, a concept called a(n):

Unshared environment

Explanation:

This concept is usually seen in genetics and psychology, where two people/species (often with similar genetic makeup) exhibit different traits if they experience a different environment.

For example, two birds of the same species, may develop into separate species based on where they live their whole lives.

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