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Unformatted text preview: Bacteria and fungi can be parasites of humans, causing anything from food poisoning to athletes foot to malaria. All viruses are pathogenic, or disease-causing. Viruses are responsible for deadly diseases such as AIDS and polio, as well as milder forms like the common cold. Some viruses have even been implicated in the development of cancer. We also have several positive relationships with microorganisms. Some soil bacteria fix atmospheric nitrogen, making it available to the plants we eat. Certain fungi grow symbiotically with plant roots, increasing their ability to obtain food and moisture from the soil. Others fungi are themselves quite tasty. Bacteria and protists that live in our intestines help us gain nutrition from food....
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- Winter '09