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- What is the difference between cell membrane and cell wall? What are the three main parts of a cell? Describe and give the main function of each.What are the units that constitute the unit of the cell? Why are they not classified under biological organization?What will likely happen to the other units (higher and lower) if one unit from the hierarchy is removed or suffers irreversible damage? What can be an example for this?What is an organelle or organelles? are they the working parts inside a cell?
