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he created the first microscope. he was the first person to see a single sell organism.
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through a microscope he saw many little box like compartments in the bark of on oak tree.
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he did a experiment to prove that living things come from other living things.
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they developed sell theory.
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he discovered that all sells come from preexisting sells.
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he did a famous experiment to prove that microorganisms come from preexisting microorganisms.
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they invented an electron light microscope.