A biological influence on homosexuality is most clearly seen from evidence of

A) sexual relations between same-sex partners in several hundred different animal species.
B) an increase in same-sex attraction among women who had fraternal twin brothers.
C) the increase in homosexual and bisexual people among males with domineering mothers.
D) the link between sexual orientation and the levels of sex hormones currently in a person's blood.

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Andrea Bidwell · Accepted Answer

Final Answer : A, Explanation :  The sexual relations between same-sex partners in several hundred different animal species suggest a biological influence on homosexuality. This indicates that same-sex attraction may have an evolutionary basis and is not just a result of cultural or social factors. B, C, and D do not provide as strong evidence for a biological influence on homosexuality.

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