| A | B |
|---|
| sessile | lifestyle inwhihc organism does not move |
| spicules | calcium or silica pieces that make up sponge skeleton |
| spongin | protein fibers that make up sponge skeleton |
| ostia | tiny pores in side of sponge wall |
| osculum | large opening at top of sponge |
| choanocytes | flagellated collar cells that cause water currents in sponges |
| spongocoel | large central cavity of sponge |
| gemmule | asexual internal buds that are dormant forms of adult sponges |
| monecious | both sex organs in one individual |
| planula | flagellated free swimming larvae |
| polyp | typically attached cnidarian body form |
| medusa | typically free swimming cnidarian body form |
| nematocysts | stinging organelles used by cnidarians |
| radial | symmetry type found in cnidarians |
| dioecious | an individual has only 1 type of sex cells |
| porifera | phylum of sponges |
| cnidaria | phylum that includes jellyfish, hydra, coral & sea anemones |
| acoelomate | animals with no body cavity |
| bilateral | symmetry type where organisms cut down center have mirror left & right halves |
| cephalization | concentration of sensory organs in one end of an organism |
| chemoreceptors | detect chemicals in environment to detect food or taste it |
| statocysts | receptors used to maintain equilibrium |
| pseudocoelom | false body cavity found between mesoderm & ectoderm |
| coelom | body cavity within mesoderm layer |
| mouth to anus | complete digestive system |
| mouth only | incomplete digestive system |
