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Zacharias Jansen made the first compound microscope.

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Robert Hooke got a piece of cork from a plant and put it under his microscope and he discover cells.

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Anton Van Leeuwenhoek scraped his off bacteria off of his teeth and put it under his custom microscope to look at, and that's when he discovered bacteria.

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Dr. Matthias Schleiden understood that plants and the different parts of the plants were made up of cells.

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Rudolph Virchow said that all living cells had to come from pre-existing cells. (to the theory of spontaneuos generation)

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Dr. Theodore Schwann discovered that animal tissue have cells within them. He said all living things are made up of cells

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Not one living thing has only been made up of only one cell.