| A | B |
|---|
| verebrates | animals with backbones |
| invertebrates | animals without backbones |
| bilateral symmetry | body parts are the same on both sides |
| radial symmetry | body parts arranged in a circle around a central point |
| sessil | organisms that remain attached to one place for their entire life |
| Porifera | means "pore-bearing" |
| filter feeders | Organisms that filter bacteria out of the water |
| collar cells | Cells that line the inside of a sponge |
| regeneration | ability of an organism to replace body parts |
| hermaphrodite | an animal that produces both sperm and eggs. |
| larva | a fertilized egg |
| cnidarians | means "stinging cells" |
| tentacles | armlike structures of an animal |
| polyp | a vase shaped cnidarian |
| medusa | a bell shaped cnidarian |
| free living | organisms that don't depend on one particular organism for food |
| anus | opening at the end of the digestive tract |
| cyst | a young worm with a protective covering |
