In twin studies, identical twins show a higher incidence of homosexuality than do fraternal twins. What does this imply about the origins of sexual orientation?
a. Parenting practices do not seem to matter as much as genetics.
b. Parenting practices seem to matter a great deal more than do genetics.
c. Twins have such similar experiences that their environments must matter.
d. None of the above.
A
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a. added b. reduced c. changed d. eliminated
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