| A | B |
|---|
| Integument | Scales |
| Filter nitrogenous waste with little to no water loss | Kidneys |
| Evolved about 70 million years ago from lizards | Snakes |
| Organ of Jacobson | Samples (tastes/smells) the air |
| Narrow snout, agressive, always grinning | Crocodile |
| Less aggressive, rounded snout, don't see teeth when the mouth is closed | Alligator |
| Ectotherm | Body temperature is the same as the environment |
| Reptile repiratory organ | Lungs |
| Amniotic egg | Has a waterproof shell |
| Allantois | Waste sac |
| Yolk | Food sac |
| Amnion | Sac surrounding embryo |
| Embryo | developing young |
| Chorion | Sac surrounding all other sacs, gas exchange occurs here |
| Reptile egg shell texture | Rubbery, not brittle |
| Types of reptiles | Lizards, snakes, alligators, crocodiles, turtles |
| Metabolism | Very slow, require much less food than birds or mammals |
| Oviparous | Lay eggs |
| Oviviviparous | Born after they hatch from eggs inside the mother |
| Viviparous | Born alive from the mother (no egg) |
