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Anton Van Leeuwenhoek was the first to observe microorganisms.
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Robert Hooke is the biologist who named the smallest living the a cell.
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Robert Brown discovered the nucleus of a cell.
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Proposed that "All living things are composed of cells and cell products."
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Stated that plant organism are made up of cells.
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Published "Every cell originates from another existing cell like it."
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Proposed the idea that certain organelles were once free-living cells themselves
