You are presented with the quiz "macroevolution occurs over what, above the level of the species?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "macroevolution occurs over geologic time above the level of the species" and "geologic time lines are expressed in geologic eras and periods". 

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


 

        eras   