In some species males donate only sperm to the female i.e., Ask an Expert

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In some species, males donate only sperm to the female (i.e., she does not receive a direct benefit). Give an example of this kind of mating system (you may use a particular species or a type of mating system) (1). What are two mechanisms that can explain female choice when females do not receive direct benefits such as food (2)? Explain how each mechanism works and give an example (2).

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