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Biodegradation in polymers refers to the natural process by which polymeric materials are broken down into simpler substances by the action of living organisms, mainly microorganisms such as bacteria, fungi, and algae, along with enzymes produced by them. In the context of the chemistry of materials, biodegradation is important because it determines how a polymer behaves after its useful life and how it interacts with the natural environment. Unlike ordinary degradation, which may occur because of heat, light, oxygen, mechanical stress, or chemicals, biodegradation specifically involves biological activity and biochemical reactions. Polymers are very large molecules made up of repeating structural units called monomers. Their high molecular mass, long chains, and often strong chemical bonds make many conventional polymers resistant to natural degradation. Materials such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride can remain in the environment for a very long period because microorganisms generally cannot easily attack their carbon-carbon backbones. Biodegradable polymers, on the other hand, contain chemical structures that can be attacked or transformed by microorganisms and their enzymes. The biodegradation of a polymer generally takes place through several stages. First, the polymer may ___ ________ ______ _____ ______ ____ ___ _______ ____ __________ ___.
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