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Originally Posted by EpicFrogNinja
Don't give your age on the internet. Just a general rule. Anyway, your teacher is right about most organisms. For example, a chimpanzee is not going to be able to breed with a seagull, no matter what happens. However, some very closely related species can breed. The resulting offspring cannot.
Actually, some can, like the Beefalo (Bison-Cow hybrid) as well as certain Macaw species (some of which are only deemed successful hybrids when they are fertile).