| A | B |
|---|
| Exoskelton | A body covering, typically made of chitin, that provides support and protection |
| Molt | To shed an old outer covering so that it can be replaced with a new one |
| Thorax | The body region between the head and the abdomen |
| Abdomen | The body region posterior to the thorax |
| Cephalothorax | A body region composed of the head and thorax fused together |
| Compound eye | An eye made of many lenses, each with a very limited scope |
| Simple eye | An eye with only one lens |
| Open circulatory system | A circulatory system that allows the blood to flow out of the blood vessels and into various body cavities so that the cells are in direct contact with the blood |
| Statocyst | The organ of balance in a crustacean |
| Gonad | A general term for the organ that produces gametes |
| Complete metamorphosis | Insect development consisting of four stages: egg, larva, pupa, and adult |
| Incomplete metamorphosis | Insect development consisting of three stages: egg, nymph, and adult |
