Why would twin studies not contribute much to our understanding of the roles of genetics and the environment in the development of sex differences?
A. Fraternal twins don't differ in their genetic makeup, ruling out a role for biology.
B. Identical twins are always the same sex, and they are subject to hormonal influences prenatally.
C. Identical twins would need to be compared to fraternal twins within the same family.
D. Not enough identical twins are put up for adoption worldwide.
Answer: B
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