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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.