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Hans and Zacharias Jensson developed the microscope allowing us to see small objects up close.
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Robert Hooke looks through a microscope and relizes that cork has these tiny little cell like rooms. He is the first person to see a dead cell.
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Anton Van Leeuwenhoek became the first person to see living cells. He was also the person who discovered bacteria. He improved the microscope by using polished lenses.
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Matthias Shleiden purposes that all plants are made of cells.
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Theodor Schwann purposes that all animals are made of cells. He also purposes that cells are the basic unit of life.
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Ruldolf Virchow publishes a book stating that cells come from other living cells(Although it may not of been truely his idea).