Habitat - The specific geographical area or physical environment that is inhabited by an organism or a population of organisms.⏎
Microbe - Sometimes referred to as a microorganism, a microbe is an organism that is microscopic and thus invisible to the naked eye. ⏎
Institute of Medicine - An independent, nonprofit organization that works outside of government to provide unbiased and authoritative advice on health and medicine to decision makers and the public.⏎