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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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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.