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1. Every organism is made of cells
2.  Cells are the base of live
3. All cells come from pre-existing cells

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The microscope was made in 1590 by Janssen and everyone wanted one, but one scientist called Leeuwenhoek made his own in 1668 that used to see everything, discovering cells in people's teeth. He called them animalcules

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R. Hooke called them cells because they reminded him of little monk rooms.

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In 1839 Schleiden liked researching plants, and  Schwann liked researching animals and the nervous system. They discovered that everything had cells. Schleiden wasn't ok with the 3rd statement of cells, which made him fight with Schwann

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R. Virchow made an experiment to prove the 3rd statement of the cell theory.  Remak, another scientist, said that the Virchow experiment was based on his information, which he said that was wrong, and another scientist fight started