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Zacharias Janssen creates compound microscope
Robert Hooke discovers pores or cells
Anton Van Leeuwenhoek built a simple microscope
he also carefully observed organism, bacteria, and blood cells
Matthias Schleiden concludes all plant tissues are made of cells
Theodore Schwann created the cell theory: the cell is the basic unit of life
Rudolph Virchow stated that all cells develop from existing cells
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