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Robert Hooke discovered a honeycomb-like structure in a cork slice using a microscope. He only saw cell walls as this was dead tissue. He named it a cell.
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Anton Van Leeuwenhoek created his own microscope and seen cells in pond water
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Anton van Leeuwenhoek stated these was the first protozoa and bacteria discovered.
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Robert Brown discovered the Nucleus in plant cell.
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All plant tissues are made up of cells, cells are the buliding blocks of plants.
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Theodor Schwann got the conclusion that not only plants, but animal tissue as well is composed of cells.
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Albrecht von Roelliker discovered that sperm and eggs also have cells
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Rudolf Virchow states all cells develop only from existing cells. Virchow was also the first to propose that diseased cells come from healthy cells.
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Anton Schneider observed and described chromosomes during cell division.
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Carl Heinrich Braun rewrites the cell theory aying cells are the basic unit of life.