| A | B |
|---|
| arthropod | animal with segmented body and skeleton with chiton and jointed appendages |
| arachnid | chelicirate arthropod with 4 pairs of legs on cephalothorax and no antenna |
| chelicerate | arthropod characterized by a 2 part body and mouthparts called chelicerae |
| crustacean | arthropod characterized by stony exoskeleton, 2 pair of antenna, and mandibles |
| chitin | complex carbohydrate found in arthropod exoskeletons and fungal cell walls |
| exoskeleton | system of supporting structures covering the outside of the body |
| mandible | mouthpart designed for biting and grinding food |
| metamorphosis | series of dramatic changes in body form in life cycle of some animals |
| molt | to shed exterior layer of skin, feathers, or exoskeleton |
| pheromone | specific chemical messages produced by an organism that affects behavior and/or development of other individuals |
| pupa | resting stage of metamorphosis in which tissues of insects are organized into adult form |
| trilobite | sea-dwelling organism belonging to the oldest, now extinct, subphylum |
