| A | B |
|---|
| Trilobite | Organism that belongs to the oldest subphylum of arthropods, that are now extinct. |
| Chelicerate | Arthropods that are characterized by a two-part body and have mouthparts called chelicerae. |
| Crustacean | Arthropods that are characterized by a stony exoskeleton, two pairs of antenna, and mandibles. |
| Uniramian | Members of the largest subphylum of arthropods; contaons centipedes, millipedes, and insects. |
| exoskeleton | Hard covering of the outside of the body. |
| chitin | Complex carbohydrate found in exoskeletons and fungal walls. |
| molt | To shed an exterior layer of skin, feathers, or an exoskeleton. |
| metamorphisis | Series of stages of change in the body form in the life cycle of some animals. |
| pupa | Resting stage of metamorphesis in which an insect is transformed into an adult. |
| arachnid | Organism found in the subphylum Chelicerata that has four pairs of legs and no antenna. |
| mandible | Mouthpart designed for biting and grinding food. |
| pheronome | Chemical messenger produced by an organism that affects the behavior and development of other individuals of the same species. |
