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First to observe plant cells, and even gave them their name because the looked like cellulae (Latin word for a small storage room)
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First to observe a single celled animal, red blood cells, and sperm cells using a microscope.
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Concluded embryonic plant plants originated from a single cell.
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Concluded that all animals also originate from a single cell. He also pulled other observations of other researchers together and concluded 1. “A cell is an organism, and all organisms are made up of 1 or more cells” and 2. A cell is the basic unit of life. Those are the first two parts of the cell theory.
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Added on more part to the cell theory: All cells develop from existing cells.
