| A | B |
| ektoskeleton | a bocy covering made of chitin, for support & protection |
| molt | shed an old outer covering, replacing it with a new one |
| thorax | body region between the head & abdomen |
| abdomen | body region posterior to the thorax |
| cephalothorax | head and thorax fused together |
| compound eye | eye with many lenses each with limited scope |
| simple eye | eye with single lens |
| open circulatory system | blood flows into body cavities where cells are in direct contact with blood |
| statogyst | organ of balance in a crustacean |
| gonad | general term for organ that produces gametes |
| complete meamorphosis | insect developing egg, larva, pupa & adult |
| incomplete meamorphosis | insect developing egg, nymph & adult |