| A | B |
|---|
| Porifera | phylum name for sponges |
| pores | tiny openings |
| spicules | small, hard needlelike structures of a sponge |
| flagellum | whiplike structure on some cells |
| collar cells | cells in a sponge that trap food particles |
| spongin | spicules made of this material are rubbery |
| cnidaria | phylum containing jellyfish, hydra, coral and sea anemones |
| cnidocytes | stinging cells |
| medusa | umbrella like form of cnidarians |
| polyp | cnidarians with a tube shaped body |
| coelenterates | another name for cnidarians |
| sponges | organisms with two layers of cells no tissues |
| cnidarians | organisms with two cell layers, but cells are organized into tissues |
| ectoderm | outer tissue layer |
| endoderm | inner tissue layer |
| mesoderm | middle tissue layer |
| Platyhelminthes | phylum name of flatworms |
| worms | group of organisms with three cell layers with organs and organ systems |
| Nematoda | phylum name for roundworms |
| flukes, tape worms, planaria | types of flatworms |
| ascaris and hookworms | types of roundworms |
| parasite | organisms that live in and on other organisms ususally causing them harm |
| Annelida | phylum name for segmented worms |
| setae | tiny, hairlike bristles used to help worms move |
| closed circulatory system | organisms have blood vessels in which blood moves |
| earthworms and leeches | types of segmented worms |
