Question

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?
they cannot breed.
their offspring cannot breed
they look different from each other
they are found in different habitats.

Explanation:

The biological species concept defines species as groups that can interbreed to produce fertile offspring. Horses and zebras produce infertile zorses, so they are separate species.

Answer:

Their offspring cannot breed.