Who proposed cell theory? Give its postulates?
The prominent cell concept was postulated by M. J. Schleiden and Theodore Schwann, which states: i) Cells and cell products make up all living things. (ii) All living creatures have a structural and functional unit called the cell. (iii) In living organisms, all metabolic processes occur within the cell. Rudolf Virchow later amended the cell hypothesis, stating that "all-new cells emerge from pre-existing cells."