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Zacharius Janssen invented the compound microscope to observe microscopic organisms. This is the first step into cell theory.
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Robert Hooke came up with the theory of cellular evolution while studying microscopic fossils.
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Anton van Leeuwenhoek discovered the microorganism using a compound microscope
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Matthias Schleiden discovered the importance of the cell nucleus (The date is for the discovery of the Nucleus itself)
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Theodor Schwann theorized that cells were the fundamental unit for all living things
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Rudolf Virchow stated that all living cells come from preexisting cells
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Louis Pasteur's first important discovery was the study of Vaccination and became famous for stopping viruses and bacteria with vaccination
