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Some fungi the parasitic and mutualistic symbionts, obtain their nutrients from living organisms.
This activity of fungi is essential for the continuation of life on earth. The fungi play an important part in degrading these molecules and thereby replenishing the carbon dioxide of the atmosphere.
Without degradative processes, life on earth would probably come to an end after a few decades because of the accumulation of plant remains and lack of free atmospheric carbon dioxide for photosynthesis.