With regard to aggression and prosocial behavior, twin studies suggest that
a. aggression and prosocial behavior do not have a noticeable biological or genetic basis.
b. boys are more aggressive than girls, and girls are more prosocial than boys.
c. twins tend to be both more aggressive and more prosocial than non-twin siblings.
d. monozygotic twins tend to be more similar than dizygotic twins.
D
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