| A | B |
|---|
| gills | body features that take in oxygen from water |
| mammals | This species has fur or hair, has milk for its young, gives live birth, is wrm-blooded, and has lungs to breathe air. |
| inherit | to receive features from parents |
| birds | This species lays eggs, has lungs, two legs, wings and feathers |
| extinct | When all of one kind of organism is gone forever |
| amphibians | This species lives in water when young and on land as an adult. They are cold-blooded, have moist skin and lay eggs in water. They breathe with gills in water and lungs on land as adults. |
| threatened | An organism whose numbers are going down |
| fish | This species has gills to breathe in water, fins, and scales. They are cold-blooded, and they lay eggs. |
| trait | A body feature that an animal is born with |
| reptiles | This species is cold-blooded, lays eggs, has lungs to breathe with, and has scales for protection. |
| fossil | Evidence of aplant or animal that lived long ago |
| endangered | A species that may become extinct |
| scales | Body feature that protects a fish or reptile |
| species | The scientific name of an organism |
| organism | a living creature |
