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Protecting and enclosing the cell,giving shape to the cell,allowing transportation of materials in and out of the cell,and carry out metabolic reactions near the inner surface of the cell membrane

Answer: Main function of cell membrane is to allow some substances inside the cell and keep some outside the cell.

Explanation: 1- Cell membrane is the semi-permeable membrane that located outside of the cytoplasm of cell. The term semi-permeable is used because cell membrane is not permeable to all the substances.

2- Cell membrane protect cell from damages.

3- Cell membrane maintain cell shape.

4- Cell membrane regulate cell growth.

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