| Term | Definition |
|---|
| crustacean | an arthropod with a hard. crusty sheel |
| regeneration | the growing back of a lost body part |
| swimmerets | leglike limbs on the underside of a lobster's abdomen that help the lobster move |
| herbivore | a plant-eater |
| carnivore | a flesh-eater |
| coral reef | a ridge of coral rock that lies at or near the surface of the water |
| mollusks | a group of soft-bodied invertebrates that includes clams, oyster, snails, and squids |
| gastropods | mollusks such as snails and slugs that have a muscular foot that they use to slide forward on a layer of slime |
| univalves | one-shelled mollusks, such as snails, conchs, and cowries |
| bivalves | mollusks that have two matching, fan-shaped shell joined by hinges, such as mussels, oysters, clams, and scallops |
| cephalopods | a group of mollusks in which the foot and head are combined into a single headlike structure |
| protozoan | a miniature invertebrate made of a single cell |
| cell | the smallest living unit in any living organism |
| cell membrane | the part of a cell that surrounds and protects the cell and determines what may enter |
| cytoplasm | the jellylike fluid that fills the volume of a cell |
| nucleus | the part of a cell, often located near the center, that directs the work of the cell |
| chromosomes | threadlike structures in a cell's nucleus that contain the instructions for running the cell and making needed parts |
| pseudopods | projections that an amoeba uses to move from place to place; means "false feet" |
| cilia | tiny, hairlike structures that cover a paramecium and allow it to move |
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