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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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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.