The process by which a cell divides to form two or more new cells is called cell division. Rudolf Virchow (1858) said, ‘As trees come from trees, so animals come from animals, right
Only cells are created from such cells. Life of unicellular or multicellular organisms starts from a single cell. In 1882, Walter Flemming first observed cell division in the marine Triturus maculosa. A human cell replicates and divides only 4-60 times. During human life, body cells divide about 10 quadrillion or 1015 times.