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Author Question: One disadvantage of natural experiments is that A) there are no control groups. B) there is no ... (Read 29 times) |
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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 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 first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.