Two species that have experienced several thousand years of isolation from one another are now incapable of producing viable offspring despite mating efforts.What type of reproductive isolating mechanism developed between the two species?

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The Answer of Two species that have experienced several thousand years of isolation from one another are now incapable of producing viable offspring despite mating efforts.What type of reproductive isolating mechanism developed between the two species?

Two Species That Have Experienced Several Thousand Years of Isolation