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Zacharias Janssen helped contribute to the cell theory because he invented the Microscope
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Robert Hooke helped contribute to this Cell Theory because he discorved the cell.
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Anton Van Leeuwenhoek helped contribute to this cell theory because he helped make the microscope lenses clearer
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Theordor Schwann helped contribute to the cell theory because he discovered that "All plants are composed of cells."
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Matthias Schleiden contributed to the cell theory because he stated that "Different parts of the plants are composed of cells."
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Rudolph Virchow helped contribue to the cell thoery because he states that "All cells come from pre-existing cells."
