Because it is possible for a female to mate with multiple males, any of whom could be the father, male mammals and birds always:
a. invest more in the care of the offspring.
b. be the choosier sex in mating.
c. have some degree of paternity uncertainty.
d. invest less in the care of the offspring.
e. mate with kin that they can trust.
Ans: c. have some degree of paternity uncertainty.
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