You are presented with the question "fish use gills for what" and the following answer choices: 
- motility
 - breathing carbon dioxide
 - courtship
 - producing oxygen
 - biodiversity
 - breathing water
 - food and shelter
 - drinking water

Now knowing that gills are used for breathing water by aquatic animals and fish are backboned aquatic animals, choose the best answer.


 

      breathing water   