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He discovered cells by looking at a cork slice under a microscope
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First person to observe bacteria & protozoa
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Concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. Also declared that the single cell is the basic building block of all plant matter
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Discovered that cells are organisms and consist of one or more cells and that the cell is the basic unit of structure for all organisms and that plants and animals consist of combinations of these organisms which are arranged in accordance with definite rules.
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Proposed that all living things must rise from pre-existing cells