Question

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"?

Answer 1

Answer: They are sterile

Explanation:

Mule is a hybrid of male donkey and female horse with different chromosome number and is considered superior to both horse and donkey. Still it is considered as a weak hybrid this is because the mule is sterile which means that it cannot reproduce further.

The mule though is superior in many ways such as it can jump and is strong. The hybrid of mule is not good as it cannot continue its next generations on earth.

They are sterile and so is a weak hybrid.