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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.