You are presented with the question "Plants detect and respond to" and the following answer choices: 
- sub-units of species
 - ocean tides
 - volcanic activity
 - heat and light
 - plate shifts
 - microorganisms
 - the rotation of the Earth
 - Temperature changing

Now knowing that plants detect and respond to the daily cycle of light and darkness and all daily cycles of the celestial objects are caused by the rotation of the Earth, choose the best answer.


 

       the rotation of the Earth  