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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.