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| tiny living organisms that can be seen only with a microscope |
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| chemical substances made by the body to fight germs |
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| microbes which are tiny plants |
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| a method of destroying harmful bacteria by heating a liquid and then cooling it quickly |
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| germs that cause diseases (smaller than bacteria) |
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| a chemical substance taken into the body to destroy harmful bacteria |
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| weakened disease germs that cause the body to make antibodies |
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