Discovered bacteria, free-living and parasitic microscopic protists, sperm cells, blood cells, microscopic nematodes and rotifers - Anton van Leeuwenhoek, Introduced the term cell in describing microscopic structure of cork. Discovered cell walls and plant cells. - Robert Hooke, Botanist that proposed the cell theory for plants and animals are composed of groups of cells and that the cell is the basic unit of living organisms - Matthias Schleiden, Discovered nucleus - Robert Brown (Discovered the nucleus), Zoologist that proposed cell theory - Theodore Schwann, Extended the cell theory by stating that new cells are formed only by the division of previously existing cells. - Rudolph Virchow,

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