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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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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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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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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.