Fact 1: Skin is used for breathing air by frogs.

Fact 2: Frogs breathe with their lungs and skin.

Given the two facts above, answer the question "What do frogs breathe with?" with the following options: 
- feet
 - air
 - triceps
 - movement
 - oxygen
 - keratin
 - gills
 - lungs


 

        lungs 