The slight differences between human male and female body size compared to other primate species suggests that humans evolved under a moderately _____ mating system.

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The slight differences in body size between male and female humans suggest that humans evolved under a moderately polygynous mating system, where one male mates with multiple females. This is because in polygynous mating systems, males typically compete with each other for access to females, leading to sexual dimorphism (difference in size or appearance) between males and females. However, the difference in human body size is not as extreme as it is in species with highly polygynous mating systems, such as gorillas. Monogamous and polyandrous mating systems would not produce such a moderate difference in male and female body size, and promiscuous mating systems would not typically lead to sexual dimorphism between males and females.

The Slight Differences Between Human Male and Female Body Size