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| any organism that uses oxygen for respiration |
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| any organism that is able to live without oxygen |
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| chemical produced by some bacteria that is used to limit he growth of other bacteria |
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| thick-walled, protective, structure produced by some bacteria when conditions are unfavorable for survival |
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| simplest form of asexual reproduction in which two new cells are produced with genetic material identical to each other and identical to the previous cell |
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| bacteria that convert nitrogen in the air into forms that can be used by plants and animals |
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| disease-producing organism |
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| organism that uses dead organisms as a food source and helps recycle nutrients so they are available for use by other organisms |
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| poisonous substance produced by some pathogens |
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| preparation made from killed bacteria or damaged particles from bacterial cell walls or viruses that can prevent some bacterial and viral infections |
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