Exoskeleton - An external skeleton that protects and supports an organism, in contrast to an internal endoskeleton.⏎
DNA - Short for deoxyribonucleic acid, DNA is any of the nucleic acids that contain the genetic instructions necessary for the development and functioning of all living organisms as well as some viruses.⏎
Endemic - The baseline level of disease usually present in a community.⏎
Ecology - A branch of science that deals with the relation of organisms to one another and their physical environment.⏎