In a study of adopted children, the finding that the only children who had a considerable likelihood of developing schizophrenia were those who had a biological parent with schizophrenia and who were also adopted into a troubled home is evidence of the:

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The finding that both biological and environmental factors (nature and nurture) interacted to increase the likelihood of developing schizophrenia indicates that the disorder is not solely a matter of genetics or environment, but rather the result of a complex interplay between the two. This supports the idea that both nature and nurture are important in determining human development and behavior. The presence of a troubled home environment suggests that environmental factors can exacerbate genetic vulnerabilities to psychopathology, further underscoring the importance of the interaction between genes and environment in shaping mental health outcomes. Random variability in the population is unlikely to account for this observed pattern, as the effect appears to be systematically related to specific factors (i.e., genetic risk and adverse environments).

In a Study of Adopted Children, the Finding That the Only