capable of being broken down by natural. organic processes and reabsorbed into the environment.

Merriam-Webster Online Dictionary
biodegradable (adjective)
capable of being broken down especially into innocuous products by the action of living things (as microorganisms) - biodegradable trash bags
biodegradable (Wikipedia)
Yellow slime mold growing on a bin of wet paper

Biodegradation is the breakdown of organic matter by microorganisms, such as bacteria and fungi.

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