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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The average adult has about 21 square feet of skin.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.