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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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There are more nerve cells in one human brain than there are stars in the Milky Way.