D. The offspring is not fertile.
Even though horses and donkeys can produce offspring (mules), the mules are usually sterile and cannot reproduce. This lack of fertility between mules demonstrates reproductive isolation between horses and donkeys, supporting the idea that they are separate species according to the biological species concept.
The biological species concept defines species as groups of interbreeding populations reproductively isolated from other groups.
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Horses and Donkeys produce mules if they interbreed.
Why are horses and donkeys considered different species, even though they can produce offspring?
A.
The offspring reproduces at a different time of year.
B.
The offspring does not live to reproductive age.
C.
The offspring can reproduce.
D.
The offspring is not fertile.
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