Relier Pairs 4.4 Cell TheoryVersion en ligne History and Basic concepts of cell theory par Susana Montealegre 1 He said that all cells are produced by dividing existing cells. 2 Postulate 1: All the organisms ..... 3 He said that all animal tissues are composed of cells 4 He was the first scientist to observe live microorganisms. 5 I conclude after studying plant tissues that all plants are made up of cells. 6 Postulate 3: All cells come from ________ 7 Scientist who observed cells in cork for the first time. He calls them celle. 8 Postulate 2 The cell is the structural unit and the _______