The Emlen and Oring model of the evolution of social mating systems is based on sexual conflict theory, which assumes which of the following?
A) Females typically invest more energy into offspring than do males.
B) Females typically are smaller than males.
C) Males and females typically differ in their lifetime number of mates.
D) Sperm competition is unimportant.
E) Sex-role reversed species do not exist.
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