An example of postzygotic hybrid sterility is a. the birth of a sterile mule for the mating of a horse and a donkey. b. the elaborate mating ritual of many bird species that them pick a fertile mate.

A

Explanation:

This is a type of reproductive isolation that prevents interspecies reproduction. There are two types of reproductive isolation; prezygotic and postzygotic isolation.  Choice B is a type of prezygotic that prevents fertilization, through behavior isolation, while postzygotic offers a sterile offspring that will not have offspring.

coal is not sustainable because it will one day run out.

the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.