Fact 1: Breathing is when a gill converts from oxygen in water into oxygen in blood.

Fact 2: Gill slits form gills in fish.

Given the two facts above, answer the question "What converts oxygen in water into oxygen in blood?" with the following options: 
- sharks
 - germs
 - Enzymes
 - starfish
 - rivers
 - Jellyfish
 - streams
 - a fish


 

        a fish 