1. Respiratory system. Amphibians have simple cellular lungs, the area of which is slightly larger than the area of the body (often even less), while reptiles have second-order bronchi, their lungs are spongy, which allows them to get rid of breathing with their skin and switch to a truly terrestrial lifestyle.
2. The circulatory system. Venous and arterial blood in the heart of amphibians mixes much more strongly than that of reptiles. Reptiles have a horizontal septum in their hearts that limits the mixing of blood (and crocodiles have a four-chambered heart).
3. The reproductive system. In males of many species, a copulatory organ appears.
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