In many ways, a mule is a superior animal to the horse or donkey. Mules are often stronger and can jump higher than either of their parents. Why, then, are mules considered to be a "weak hybrid"?
A. Their offspring are progressively weaker than the parents.
B. They are more prone to disease than are horses and donkeys.
C. They do not live as long as horses and donkeys.
D. They are sterile.
Answer: D
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