Biodegradability is the capability of a material to be broken down by living organisms, such as bacteria, fungi, or water molds, and reabsorbed by the natural environment. The term usually refers to the natural breakdown of waste by microorganisms. All biodegradable materials are formed of organic compounds, which means they contain carbon atoms, and they may be naturally occurring or human-made. Mineral substances (e.g., metals, glass, and conventional plastics) are not considered biodegradable, though they may physically break down over extended periods of time. The disposal of nonbiodegradable waste is a primary source of pollution. For a material to be ...(100 of 1017 words) Access the full article Help support true facts by becoming a member. Subscribe today!