How do frogs breathe underwater?
frogs breathe through there skins. but the frog has lungs but no
ribs! They don't. Frogs can hold their breath for a very long time
but they still have to come to the surface to breath air.
They don't, they hold their breath like we do, they can just do it a long time. During their tadpole stage, they breathe under water through their skin, using internal gills. When they mature into frogs, they develop lungs and then can only breathe air using their lungs.