They are the smallest animals in the world I suppose. While most animals are made up billions and trillions of cells, the amoeba is made up of only one cell. They are small enough to get into you body and cause problems.
Some common species of amoebas feed on decaying matter at the bottom of freshwater streams and stagnant ponds. The best-known of these, Amoeba proteus, is used for teaching and cell biology research. Parasitic species include Entamoeba coli, which resides harmlessly in human intestines, and Entamoeba histolytica, which is found in places where sanitation is poor and is carried by polluted water and sewage. Infection with Entamoeba histolytica causes a serious intestinal disease called amoebic dysentery, marked by severe diarrhea, fever, and dehydration.
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