The theory proposed by Robert Trivers (1972) used sex differences in parental investment to explain different mating systems. If the females compete with one another for access to males and are larger, stronger, more active, and more aggressive than the males of the species, this would be typical of a ___________________ mating system.

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The theory suggests that in species where females compete for males, often due to higher female parental investment, a polyandrous mating system is likely. This is where one female mates with multiple males, which aligns with the scenario of competitive, larger, and more aggressive females.

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