Plants, animals, fungi, protists, bacteria ALL are made of cells. Variation in size of cells 3. Most multicellular organisms begin life as a single cell. Development - the process by which a multicellular organism is produced from a single cell. Robert Brown - English botanist who discovered Brownian motion and coined the term nucleus 4.
All cells come from other cells.
A. Later cell discoveries 1. Louis Pasteur - French chemist who disproved spontaneous generation. B. Cell division 1. Mitosis is replication and division of the nucleus. Cytokinesis is separation of the cytoplasm.