| A | B |
|---|
| Hibernation | The state of being inactive during cold weather. |
| Amphibian | An animal that lives part of its life in water and another part on land. |
| Reptile | An animal that has dry, scaly skin and can live on land. |
| Warm-blooded | Having a body temperature that is controlled so that it stays about the same no matter what the temperature of the surroundings. |
| Mammals | An animal that has hair and feeds milk to its young. |
| Cartilage | A tough, flexible tissue that supports and shapes the bodies of some fish and some animal parts. |
| Gills | A stucture used by fish and some other animals to breathe in water. |
| Chordate | An animal that, at some time in its life, has a tough, flexible rod along its back. |
| Mammary Gland | Body parts that produce milk. |
| Endoskeleton | A skeleton on the insde of the body. |
| Cartilage Fish | Jawed fish in which the entire skeleton is made of cartilage. |
| Bony Fish | Fish that have skeletons made mostly of bone. |
| Jawless Fish | Fish that have no jaws and are not covered with scales. |
| Cold-blooded | Having a body temperature that changes with the temperature of the surroundings. |
