| A | B |
|---|
| arthropod | invertebrate with an exoskeleton, jointed appendages, and a segmented body |
| exoskeleton | hard outer structure, such as the shell of an insect or crustacean, that provides protection and support for the organism |
| chitin | tough, protective polysaccharide that makes up arthropod skeletons and the cell walls of some fungi |
| appendage | extension, such as an antenna or arm, that is attached to the body |
| segmentation | repeated sections of an animal's body that contain the same set of body structures, apart from its distinct head and tail region |
| crustacean | any of the aquatic arthropods, such as lobsters, crabs, and shrimps, that has a segmented body, an exoskeleton, and paired, jointed limbs |
| cephalothorax | region of an arthropod body where the head and thorax meet |
| abdomen | part of an arthropod's body that is behind the thorax |
| carapace | plate of exoskeleton that covers the head and thorax of a crustacean |
| mandible | appendage that is used to crush and bite food |
| chelicerate | arthropod that lacks antennae and has four pairs of walking legs and a pair of fang-like mouth parts |
| arachnid | terrestrial chelicerate, such as a spider |
| book lung | respiratory organ that has several membranes that are arranged like the pages of a book |
| spiracle | hole on the body of an arthropod's exoskeleton through which air can be taken in or released |
| trachea | a system of branched tubes in the bodies of arthropods that allow for breathing (plural: tracheae) |
| incomplete metamorphosis | process by which immature organisms look similar to their adult form |
| complete metamorphosis | process by which immature organisms change their body form before becoming an adult |
| pupa | stage of metamorphosis in which the organism reorganizes into a completely new body form |
| insecticide | chemical that is used to kill insects |
| vector | organism, such as a mosquito or tick, that transfers pathogens from one host to another |
