Fact 1: Most amphibians breathe with gills as larvae and with lungs as adults.

Fact 2: All frogs are amphibians.

Given the two facts above, answer the question "What do frogs breathe with when they are adults?" with the following options: 
- skin
 - fins
 - lungs
 - oxygen
 - gills
 - air
 - Energy
 - Gases


 

   lungs      