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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Illicit drug use costs the United States approximately $181 billion every year.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are approximately 3 million unintended pregnancies in the United States each year.