Final answer:
Frogs breathe using buccal pumping which creates negative pressure to inhale air, while nonavian reptiles use aspiration, also relying on negative pressure for inhalation.
Step-by-step explanation:
Air breathing in frogs occurs through buccal pumping which generates negative pressure (relative to ambient pressure) to bring air into the lungs, while in nonavian reptiles, breathing occurs through aspiration which generates negative pressure to bring air into the lungs.
Amphibians such as frogs use buccal pumping to breathe. This method involves the frog taking air into its mouth cavity (buccal cavity) and then closing its nostrils and elevating the floor of the mouth, pushing air into the lungs. Nonavian reptiles, on the other hand, utilize a different mechanism called aspiration. Here, muscles expand the rib cage and create a vacuum that causes air to flow into the lungs, similar to the method seen in mammals though less efficient due to the absence or reduction of the diaphragm.