You are presented with the question "what detects and responds to the daily cycle of light and darkness?" and the following answer choices: 
- fens
 - apples
 - oxygen
 - Oak
 - gravity
 - amoeba
 - earth's rotation
 - bushes

Now knowing that plants detect and respond to the daily cycle of light and darkness and all plants are of bush type, choose the best answer.


 

        bushes 