| A | B |
|---|
| Arthropod | Animal having a segmented body, an exoskeleton containing shitin, and a series of jointed appenddages. |
| Trilobite | Sea-dwelling organism. |
| Chelicerate | Arthropod characterized by a two part body and mouth parts called a chelicerae. |
| Crustacean | Arthropd characterized by a stony exoskeleton, two pairs of atennae, and mandibles. |
| Uniramian | Contain centipedes, millipeded, and insects. |
| Exoskeleton | Supported structures covering the outside of the body. |
| Chitin | Complex carbohydrate. |
| Molt | To shed an exterior layer of skin. |
| Metamorphosis | Series of dramatic changes in the body form in the life cycle of some animals. |
| Pupa | Resting stage of metamorphosis. |
| Arachnid | Chelicerate arthropod that has four pairs of legs, a cephalothorax, and no antennae. |
| Mandible | Mouthpart designed for biting and grinding food. |
| Pheromone | Specific chemical messager produced by an organism that affects the behavior and/or development of other individuals of the same species. |
