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Microorganisms can be useful to us because they help us digest our food in our bodies.
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Bad ones make us sick.
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Bad or good we can't live without them.
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Did you know that they help make bread,wine,cheese, and milk?
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Scientists are working on making nanotechnology with the shells of diatoms.
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They can kill of other bad microorganisms!(vaccinations)
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They help prevent overpopulation. If people and other organisms didn't die from disease, we would be left with weak organisms because nothing would be there to kill them.