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Used a convex lens as a magnifying glass
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constructed the first compound microscope using two lenses inside a tube.
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further developed comound microscope.
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described unicellular organisms
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Discovered bacteria
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Identified the nucleus
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Formulated the cell theory that all living matter is composed of small units called cells.
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'where a cell exists there must have been a pre-existing cell'
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built first electron microscope
