Gene - The physical and functional unit of heredity made up of DNA. Every individual has two copies of each gene, one inherited from the mother and the other from the father.⏎
Contagion - A general term for any disease-causing infectious agent spread by direct or indirect contact.⏎
Ecology - A branch of science that deals with the relation of organisms to one another and their physical environment.⏎
Cirrhosis - A condition caused by chronic liver disease characterized by the development of scar tissue leading to a loss of liver function.⏎
Fungi - A taxonomic kingdom of spore-forming organisms distinct from plants, animals, and bacteria that includes microorganisms such as yeast and molds, as well as mushrooms.⏎