You are presented with the question "What converts oxygen in water into oxygen in blood?" and the following answer choices: 
- sharks
 - germs
 - Enzymes
 - starfish
 - rivers
 - Jellyfish
 - streams
 - a fish

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


 

        a fish 