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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The longest a person has survived after a heart transplant is 24 years.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.