Horses and zebras can be bred to produce a zorse, which is infertile. Which is most likely the reason zebras and horses are considered separate species?

Question

Revolt · Accepted Answer

Their offspring cannot breed.

Biological Evidence and the Fossil Record — Unit test

Horses and zebras can be bred to produce a zorse, which is infertile. Which is most likely the reason zebras and horses are considered separate species?

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