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to destroy all living micro-organisms.
damage to the ozone layer caused by pollutants such as CFCs.
animal wastes (particularly urine) that contain materials high in nitrogen.
a disease caused when the body's immune system destroys other body cells.
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...
a small finger-like blind-ending extension of the mammalian large intestine connected to the...