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Hans and Zacharias Jensen created the first compound microscope.
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Robert Hooke examined a slice of cork through a compound microscope and discovered that it had tiny roomlike structures. He was reminded of the rooms the monks live in and decided to call the structures cells.
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Anton van Leeuwenhoek looked at blood, rain water, and teeth scrapings. He observed living cells and he then called them "animalcules". The name was later changed to bacteria.
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He studied botany and discovered that all plants are made of cells.
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A zoologist that studied animals under a microscope and concluded that animal parts are composed of cells.
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German physcian that said all living cells come from other living cells.
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