what is a cell ? what is cell wall ?
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the cell is the smallest structural unit in a human body
cell combine to form tissue
tissue combine to form muscles
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The cell wall is the protective, semi-permeable outer layer of a plant cell. A major function of the cell wall is to give the cell strength and structure, and to filter molecules that pass in and out of the cell. A cell is the smallest part of an organism that still contains that organism's elements.
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