You are presented with the quiz "macroevolution is evolution 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 is evolution 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     