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The cell wall is a tough, flexible but sometimes fairly rigid layer that surrounds some types of cells. 

The 'cell membrane' that separates the interior of all cells from the outside environment. 

Cell nucleus is a membrane-enclosed organelle found in eukaryotic cells. It contains most of the cell's genetic material
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Only plant cells consists of cell wall which give plant a rigid support to stand upward.
Both animals and plants cells have cell membrane it a semi-permeable membrane which surrounds the cells and protect it.
Nucleus is the BRAIN of the cell or the control centre , it coordinates all the functions within the cell. 
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