| A | B |
|---|
| Characteristic | a physical trait that helps identify an organism |
| Organism | a living thing |
| Resemble | to look like |
| Offspring | a new organism produced by one or more parents |
| Amphibian | cold-blooded vertebrate typically living on land but reproducing in water, offspring undergo metamorphosis into adult form |
| Metamorphosis | the process of transformation from an immature form to an adult form in two or more distinct stages |
| Mammal | any warm-blooded vertebrate having the skin mostly covered with hair; their offspring is born alive |
| Bird | warm-blooded, egg-laying vertebrates characterized by feathers and wings |
| Fish | mostly cold-blooded aquatic vertebrate usually having scales and breathing through gills |
| Reptile | cold-blooded vertebrate |
| Vertebrate | an animal distinguished by the possession of a backbone |
| Invertebrate | an animal lacking a backbone |
| Egg-laying | characteristic of birds |
| Gills | respiratory organ of fish and some amphibians |
| Lungs | principal organ of the respiratory system for most vertebrates |
