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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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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 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.