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Zaccahrias Janssen and his father Hans started to put several lenses in a tube and made a very important discovery. The object near the end of the tube appeared to be bigger much larger than any simple magnifying glass could do.
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Robert Hooke discovered cells by looking at a slice of cork oak tree bark with a microscope he invented. The cells reminded him of the rooms in which monks live in. Cell is "cellula" in Latin which means "small rooms".
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Anton van Lleuwenhoek made it possible to see single-called organisms with a magnification of 270x in only one lens
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Matthias Schleiden observed plant cells and found that all plants are made of cells. This led to "the cell is the basic unit of life" in the cell theory.
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Theodor Schwann observed animal cells and concluded that all animals are made of cells. This also led to "the cell is the basic unit of life" in the cell theory.
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Rudolf Vichow stated that cells don't just appear. Cells come from cells that already exist. This led to the cell theroy, "all cells come from prexisting cells"
