You are presented with the question "macroevolution occurs over what, above the level of the species?" and the following answer choices: 
- atmosphere
 - years
 - growth
 - outer space
 - stress
 - Joules
 - humans
 - eras

Now knowing that macroevolution occurs over geologic time above the level of the species and geologic time lines are expressed in geologic eras and periods, choose the best answer.


 

        eras 