Genetics - A branch of biology that studies heredity and variation in organisms.⏎
Epidemic - An often sudden increase in the level of disease in a specific population over a given period of time.⏎
Exoskeleton - An external skeleton that protects and supports an organism, in contrast to an internal endoskeleton.⏎
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.⏎