You are presented with the question "What do aquatic animals breathe with?" and the following answer choices: 
- Water
 - tails
 - nose
 - air
 - gills
 - oxygen
 - lungs
 - mussels

Now knowing that gills are used for breathing water by aquatic animals and fish gills take oxygen from the water as it passes over the gills, choose the best answer.


 

     gills    