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Final answer:Cell membranes A) isolate cell contents, allow cell communication, and regulate substance movement, but do not provide an energy source for the cell.Explanation:The question pertains to the functions of cell membranes, which are to isolate the cell's contents from the external environment, allow communication between cells, and regulate the movement of substances into and out of a cell.However, cell membranes do not provide an energy source for the cell; they are not specialized for capturing or generating energy like mitochondria are.The cell membrane's role includes providing attachments between cells and defining a cell's border, making it dynamically interactive with its environment....