You are presented with the question "What breathing use gills to convert oxygen in blood?" and the following answer choices: 
- sharks
 - octopus
 - hippos
 - a fish
 - Lobsters
 - water bugs
 - trout
 - alligators

Now knowing that breathing is when a gill converts from oxygen in water into oxygen in blood and shark gills remove the oxygen from the water, choose the best answer.


 

 sharks        