Bacteria, algae, and protozoa are some microorganisms that are easily overlooked in our daily lives. They can be found in a wide variety of locations and serve innumerable ecological purposes. While some such organisms have been associated with disease, they have also been invaluable in agriculture and in the production of certain foods, medicines, and other necessities. This informative volume examines the properties and uses of these powerful and essential life forms. Graphic organizers and detailed images bring the minuscule details of these entities into splendid focus.