Endemic - The baseline level of disease usually present in a community.⏎
Evolution - The change in heritable traits in a population of organisms over successive generations.⏎
Contagion - A general term for any disease-causing infectious agent spread by direct or indirect contact.⏎
Gastrointestinal Tract - The structure in the body, beginning with the mouth and extending to the anus, through which food is ingested, broken down, and absorbed to provide the body with nutrients, and waste products are excreted.⏎
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.⏎