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AMOEBA

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Every time you drink a glass of water you swallow several amoebas. These creatures are made up of only a single cell--unlike ourselves; each of us contains many millions of cells. Amoebas are found in both saltwater and freshwater and in the soil. They also live inside human beings and animals. Most types are harmless, but one variety can cause a disease called amoebic dysentery in human beings. Amoebas vary in size from about 1/100 inch (0.25 mm) to ...

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