KEY TAKEAWAYS •
There are several kinds of microorganisms that range from viruses to bacteria to multicellular pathogenic helminths.
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The first microscopes were invented in the 1600s in Europe.
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There are different types of light microscopy plus two different types of electron microscopy.
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Scanning probe microscopy does not use light waves or electron waves.
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There are positive stains and negative stains in light microscopy.
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Electron microscopy stains usually involve heavy metals.
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