The theory proposed by Robert Trivers (1972) used sex differences in parental investment to explain different mating systems. If both female and male parental investment is high, then Trivers's analysis would predict a _______________ mating system.

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Trivers's theory suggests that when both sexes invest heavily in parenting, a monogamous mating system is most likely to evolve, as both parents are needed to ensure the survival and success of their offspring.

The Theory Proposed by Robert Trivers (1972) Used Sex Differences