Twin studies by Bailey and Pillard (1991)suggest that homosexuality is a result of:

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The twin studies by Bailey and Pillard found that there was a higher concordance rate for homosexuality in identical twins (who share 100% of their genes) than in fraternal twins (who share only 50% of their genes). This suggests that there is a genetic component to homosexuality, but it is not solely determined by genetics. Environmental and social factors can also play a role in the expression of this genetic predisposition. Therefore, the best choice is D - a complex interplay between biology and social factors.

Twin Studies by Bailey and Pillard (1991)suggest That Homosexuality Is