Monogamy, a relatively rare system outside of birds, evolves when:
a. it is dangerous to compete for multiple mates.
b. males compete for females who have higher parental investment.
c. both males and females have low parental investment.
d. both males and females have high and equal parental investment.
e. females compete for males who have higher parental investment.
Ans: d. both males and females have high and equal parental investment.
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