Micro-organisms . . pin head. A gram of soil contains about 1 million bacteria. 5 million to 50 million per square inch on our teeth A gram of our colon contains about 300 billion bacteria . But how small is small?. Definitions. Parasites feed on living hostsSaprophytes feed on dead matterDecomposers breakdown dead matter and recycle the nutrientsPathogens are disease causing organisms (most parasites are also pathogens)Extra cellular digestion is the process by which bacteria and fungi fe273
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