Which of the following approaches has provided the most documented and consistent evidence for a biological basis for sexual orientation?

Question

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Genetic studies have provided the most consistent evidence for a biological basis for sexual orientation. Twin studies have shown that there is a higher concordance rate for sexual orientation among identical twins than fraternal twins, suggesting a genetic component. Additionally, studies have found certain genetic markers that are associated with homosexuality. While hormone and brain structure studies have also shown differences between heterosexual and homosexual individuals, the findings have been less consistent. Social learning studies suggest that environmental factors can play a role, but do not provide evidence for a biological basis.

Which of the Following Approaches Has Provided the Most Documented