| A | B |
|---|
| Porifera | phylum named for tiny openings called pores |
| polyp | sessile tube-shaped stage of cnidarians |
| invertebrate | an animal that does not have a backbone |
| collar cells | cells that move water through sponges |
| hermaphrodite | an animal that produces both sperm and egg |
| radial symmetry | body parts are arranged in a circle |
| bilateral symmetry | body parts are arranged the same on both sides |
| vertebrate | an animal with a backbone |
| cnidarians | animals that contain stinging cells |
| filter feeders | organisms that filter food out of the water |
