Which Of The Following Is An Example Of A Postzygotic Reproductive Barrier?

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Which Of The Following Is An Example Of A Postzygotic Reproductive Barrier?

A) One species of flower grows in forested areas, another in meadows. B) Two pheasant species perform different courtship dances. C) One species of frog mates in April, but another mates in May. D) The sperm of a marine worm can only penetrate eggs of the same species. E) Two fruit flies of different species produce sterile offspring.
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Two fruit flies of different species produce sterile offspring.

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