Before transferring sperm to the female during mating, the males of some species of beetles use their copulatory organs to remove the sperm of other males. In cases in which a female mated first with a male of a different species, the male of her own species is particularly adept at removing the other male's sperm. This is an example of _______ isolation.

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Mechanical isolation occurs when differences in the size or shape of reproductive organs prevent successful mating between different species. In this case, the male beetle's ability to remove sperm from a different species is an example of mechanical isolation.

Before Transferring Sperm to the Female During Mating, the Males