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They invented the first compound microscope using two convex lenses and a tube.
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Robert discovered a honey comb like structure in a cork slice using a primitive compound microscope. The only thing he could see was cell walls. The cell walls were dead tissue though.
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He was the first to see, discover, and draw bacteria.
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He created what is known today as the, "Cell Theory."
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He said that all organisms are composed of cells. Him and Matthias basically made up the theory of life.
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Rudolph published, "every cell stems from another cell." He also stated that all diseases start in a normal cell.
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Adds the third part of the cell theory