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These are all the people who contributed to cell theory

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Person
What they did
Anton Van Leeuwenhoek   Built one of the world's first microscopes. In 1680, he discovered microscopic creatures that could not be seen by the naked eye.  
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Robert Hooke   In 1665, He looked at thin slices of cork with a microscope and saw little empty boxes, which he called cells. In 1680, He proved Van Leeuwenhoek was right when Hooke repeater Van Leeuwenhoek's pepper water experiment.  
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Matthias Schleiden   In 1838, he studied plant parts under a microscope and concluded that all plants were made of cells  
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Theodor Schwann   In 1839, he studied animal parts under a microscope and concluded that all living things were made of cells.  
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Rudolph Virchow   In 1854, he studied all types of cells and concluded that all cells come from existing cells.  
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