| A | B |
|---|
| vertebrate | animal with a backbone |
| invertebrate | animal without a backbone |
| symmetry | arrangement of an animal's individual body parts |
| cnidarian | phylum of hollow-bodied animals with stinging cells |
| polyp | vase-shaped body plan of a cnidarian |
| medusa | bell-shaped body plan of a cnidarian |
| free living | an animal that does not depend on another organism for food or shelter |
| parasite | an animal that needs another organism for food and shelter |
| sponge | the simplest of all animals |
| hydra | an example of a polyp |
| jellyfish | an animal that has a medusa shaped body plan |
| tapeworm | a type of parasitic flatworm that does not have a digestive system |
| heartworm | type of roundworm; most common animal |
| radial | type of symmetry with parts arranged in a circle around a central point |
| bilateral | animal symmetry with parts that are mirror images of the other |
| asymmetrical | body plan with no definite shape |
