| A | B |
|---|
| backbone | vertebrates |
| no backbone | invertebrates |
| fish | live in water their whole life |
| amphibians | live in water and on land |
| reptiles | dry, thick skin with scales |
| birds | have feathers and wings |
| mammals | drink milk from mother |
| sponge | body hollow tube with holes |
| sea anemone | soft body with tentacles |
| flatworms | bodies are flat |
| roundworms | bodies are round |
| earthworms | bodies are segmented |
| snail | has a shell |
| lobster | tough outer skeleton jointed legs |
| starfish | spiny skin tubelike feet suction cups |
| shark | cartilage down back and jaws |
| frog | four legs born in water lives on land |
| ostrich | bird that doesn't fly |
