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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Blood is approximately twice as thick as water because of the cells and other components found in it.