Introduction to Microorganism1

Introduction to Microorganism1 - Bacteria and fungi can be...

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Introduction to Microorganisms Introduction Life began on a small scale. The first organisms were single cells. Sometimes small groups of cells formed. Eventually, these microorganisms evolved into complex multicellular organisms. The fact that microorganisms still exist today in many forms is a testament to the quality of this original life form. Microorganisms have adapted to inhabit almost every corner of the world. They live in the oceans and lakes, where they provide a valuable food source for larger organisms. They live on land where they may the decay of dead organic material, recycling valuable nutrients. Many even live within other, larger organisms that they may help or hinder. Humans have several reasons to be interested in the study of microorganisms. Many microorganisms cause disease in humans.
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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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