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In terms of ecological significance, cellulose is fundamental for many organisms beyond plants. Certain bacteria, fungi, and protists have evolved enzymes, known as cellulases, capable of breaking down cellulose into glucose. This process is essential for nutrient cycling, as it allows the release of energy stored in plant biomass, ultimately contributing to the food web within ecosystems. Ruminants and termites are notable examples of animals that rely on microorganisms in their digestive systems to break down cellulose, facilitating their ability to derive energy from fibrous plant materials.