Have you ever wondered how I breathe without a nose or lungs? You breathe through your lungs. Your lungs take in oxygen and give off carbon dioxide.
Worms do not have lungs but I breathe through my skin. I take in oxygen through my skin and it goes right into my bloodstream. My skin must stay wet in order for the oxygen to pass through it, but if I am in too much water I will drown. Just keep me damp, moist and slimy. Although if the water has lots of air in it, I can stay under for a long time.