| A | B |
|---|
| nematocysts | stinging structures used for catching prey |
| Cnidaria | soft-bodied animals with stinging tentacles |
| central nervous system | cnidarians, as very simple animals, lack this. |
| epidermis | outer layers of cells |
| gastroderm | layer of cells that cover the interior surface of the gastrovascular cavity. |
| tentacle | manipulative structures used for movement (ecchi) |
| Scyphozoa | class containing jellyfish |
| muscle cells | replaced by special epidermal cells |
| Anthozoa | contains sea anemones and corals |
| corals | cnidarians that form rock-like colonies. |
| gastrovascular cavity | where digestion takes place |
| radial symmetry | type of symmetry cnidarians possess |
| mesoglea | a thin layer in polyps and a thick layer in medusae. |
| medusae | motile bell-shaped cnidarian |
| polyp | sessile flower-like cnidarian |
| photosynthetic protists | these live in the cells of the gastroderm |
| statocysts | organs involved with balance |
| ocelli | eyespots; detect the presence of light |
| Hydrozoa | cnidarians that spend much of their lives as polyps, young are medusae |
| budding | means of reproduction where the young splits off the parent organism |
