You are presented with the quiz "If all members of a species cannot produce offspring then that species will likely become what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if all members of a species cannot produce offspring then that species will likely become extinct" and "if an animal become extinct, it's gone forever". 

So, what's the best answer to the question?


 

        gone forever   