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

Fact 2: Sharks breathe under water.

Given the two facts above, answer the question "What animal uses gills to breathe?" with the following options: 
- Shark
 - Platypus
 - salmon
 - trout
 - Whale
 - mussels
 - Crow
 - a fish


 

 Shark        