You are presented with the question "What animal uses gills to breathe?" and the following answer choices: 
- Shark
 - Platypus
 - salmon
 - trout
 - Whale
 - mussels
 - Crow
 - a fish

Now knowing that breathing is when a gill converts from oxygen in water into oxygen in blood and sharks breathe under water, choose the best answer.


 

 Shark        