While more sophisticated than early biological theories, the findings of the biological studies of the early 20th century (such as the family studies, twin studies, adoption studies, and studies of twins separated at birth) were criticized for not separating out the effects of environmental impact and genetics.

Question

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The statement correctly reflects the criticism of the early biological studies of the 20th century. These studies were criticized for not accurately separating out the effects of genetics and environmental impact on human development and behavior.

While More Sophisticated Than Early Biological Theories, the Findings of the Biological