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Made the first compound microscope
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He discovered the cellular composition of cork. He also introduced the word cell.
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Made a different microscope from the one that Hans and Zacharias made.
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He discovered bacteria from a sample of stuff from his teeth.
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Discovered that plants were made up of cells
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Discovered that animals were made up of cells.
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He stated that all living things come from other living things. He wrote a book about it, but Sir Isaac Newton did too. Since everybody knew Sir Isaac Newton they bought his book and Rudolph didn't sell any.