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tl;dr: There are 720 variations of the animal that have different sexual reproduction limitations with each other. They have the same anatomy but differ on the DNA level.

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If an organism have enouth DNA diference that dosen`t allow it to reproduce with another, that would not make it another species?

No. It's just a small part of the DNA (like male vs female in most animals). The organism that can't reproduce with another organism still came from two of the same organisms.

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