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Bacteria play a valuable role in digestion in that they break down various larger food molecules into smaller ones. They live in the gut of many animals and insects, and the different bacteria in termites, for instance, allow them to digest wood while humans cannot. Their roles in the natural world range from producing chemicals used in medicine and manufacturing to providing food sources for larger organisms. They can live in hostile environments. They can help clean up some toxic spills. Life on Earth would likely be impossible without bacteria.

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14y ago

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