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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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The familiar sounds of your heart are made by the heart's valves as they open and close.