The concept of "Omnis cellula-e-cellula" regarding cell division was first proposed by

“Omnis cellula-e-cellula” means new cells are formed from pre-existing cells. This statement was issued by Rudolf Virchow to explain as to how the new cells are formed.Aristotle was the earliest to attempt a more scientific basis for classification.  Aristotle had used simple morphological characters to classify plants in trees, shrubs and herbs. He also divided animals into two groups based on presence or absence of RBCs.Theodore Schwann was a British Zoologist who studied different animal cells and reported that cells had a thin outer layer which is today referred to as plasma membrane.Schleiden was German botanist and he examined many plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant.