By Elizabeth Gilbertson
Anton van Leeuwenhoek was the first man to witness the cell in 1674 as living. Anton used much better lenses and could see the cell much clearer.
Theodor Schwann,Matthias Schlieden and Rudolf Virchow created the cell theory. Theodor suggested in 1839 that cells are the basic unit of life, and proposed a method called “free cell theory" which some of his colleagues did not agree to. In 1855 Rudolf Virchow concluded all cells come from pre existing cells. Matthias Schlieden and Theodor Schwann were the first to formulate the principles of biology in 1838. Schlieden also discovered the cell nucleus and cell division.