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In 1665 Robert Hooke a English Scientist Discovered the history of microscopy and invented the microsope
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In 1674 He wanted to study things through a microscope so he created but improved the magnification of 200 times more better, He also was the first one to study cells through a microscope and so algae too and called the animalcules that look like small tiny animals roaming the world
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In 1838 Matthias Schleiden was the first to make a theory about cells being the basic unit of life and about cell division
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In 1839 Theodor Schwann is the one who says that all cells are organisms such as animals and plants, And also says that Organisms consist of more than one or more cells
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In 1855 Rudolf Virchow a german doctor had some discoveries on cells, and made some cell theory's too like the cell is the basic unit of life and also he was known for his theory in 1855