Amphibians can absorb oxygen through their skin - reptiles need to physically breathe.
because they don't work as hard as humans do
Most reptiles use diffusion through the skin to obtained oxygen.
Reptiles don't get oxygen from the water. All reptiles have to come up to the surface to breathe, but can hold their breath a long time.
Mammals maintain a higher body temperature. In order to do so, they require more energy and that requires more oxygen.
Yes, mammals have a 4chambered heart, while reptiles only have a 3chambered heart.
No, its just some reptiles that obtain oxygen through their skin. Many of them breath through their lungs.
Lizards are reptiles and all reptiles breathe using lungs.
Reptiles, fish, and amphibians mostly all have eyes. For the most part they have structures with which to move and most have blood to bring oxygen to organs.
Obviously oxygen from the air.
Frogs, like all other reptiles, get their oxygen through their lungs
No. Reptiles commonly reporduce on land.