Which of the following methods provides the LEAST conclusive evidence that a trait is heritable?

Question

Quizplus · Accepted Answer

Family studies can suggest that a trait may be heritable, but they cannot provide conclusive evidence since shared environment could be a confounding factor. Twin studies, adoption studies, and selective breeding all provide stronger evidence for the heritability of a trait since they account for environmental factors in different ways.

Which of the Following Methods Provides the LEAST Conclusive Evidence