GKFix MCQ Question

What is the correct statement of the modern cell theory?

• A. All organisms are made of tissues; cells arise from non-living matter.
• B. Cells can spontaneously generate; they are not related to other cells.
• C. Cells are the structural unit of life but not functional units.
• D. All living organisms are composed of cells and products of cells; all cells arise from pre-existing cells.