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Zacharias Janssen
Created the first microscope (1590)
Robert Hooke
Studied cork and coined the term cells (1665)
Anton Von Leeuwenhoek
Studied microorganisms called animalcules (1647)
Matthias Schleiden
–All plants are composed of cells (1838)
Theodore Schwann
All animals are composed of cells (1839)
Rudolph Virchow