Which of the following points were not explained by Schleiden and Schwann when they formulated their original cell theory?
- AAll plants are composed of different kinds of cells which form the tissues of the plant
- BAnimal cells had a thin outer layer which is today known as the 'plasma membrane'
- CCells divide and new cells are formed from pre-existing cells
- DThe presence of cell wall is a unique character of the plant cells
✓ Correct answer: C
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