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

Fact 2: Most fish breathe through gills.

Given the two facts above, answer the question "How do fish get oxygen?" with the following options: 
- muscles
 - gills
 - water
 - dorsal fin
 - eyes
 - skin
 - rivers
 - blood


 

  gills       