| A | B |
|---|
| Annelida | A phylum of animals with bodies made up of many similar segments; segmented worms |
| anterior | Pertaining to the front, or head, end of a bilateral symmetricla animal |
| bilateral symmetry | A type of summetry in which the division of the organism results in two parts that are mirror images of each other |
| bivalve | A member of the class Bivalvia, including clams, oysters, mussels, and scallops; a mollusk having a two-part, hinged shell and no head or radula |
| cephalopod | A member of the class Cephalopoda, including the octopus, squid, and nautilus; a mollusk having a distinct head and tentacles |
| cnidoblast | a stinging cell found in coelenterates, which is used for defense and capturing food |
| Coelenterata | A phylum consisting of hydras, jellyfish, and corals; cup shaped animals with hollow gut |
| coelom | the fluid-filled body cavity between the body wall and the digestive tube |
| collar cell | A type of flagellated cell found in the inner layer of a sponge |
| dorsal | Pertaining to the upper side or back of a bilaterally symmetrical animal |
| foot | A large ventricle, muscular structure that functions in locomotion in mollusks |
| gastropod | A member of the class Gastropoda , including snails, slugs, and whelks; a mollusk having a head with tentacles and a one-piece, straight, or spiral shell |
| gastrovascular cavity | The internal body cavity of a coelenterate |
| gemmule | A group of cells enclosed in a tough outer covering |
