| A | B |
|---|
| Amniotic Egg | Water-proof egg that allows reptile to live on land |
| Ventricle | Heart chamber that is partially divided by muscle wall |
| Chorion | Watertight protective membrane that lets oxygen into developing embryo |
| Amnion | Encloses embryo within a watery environment |
| Yolk | Rich supply of food inside the egg |
| Number of reptile heart chambers | three (two atriums & one ventricle) |
| Keratin | Thick protein making up reptiles scales |
| Ectothermic | Relies on environment to maintain constant body temperature |
| Hypothalamus | Area of brain that controls body functions; aids in temperature regulation |
| Metabolism | Continuous chemical & physical processes in a living organism |
| Type of circulatory system | Double-looped |
