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A cell is capable of carrying out all the life functions; such as nutrition, excretion, respiration, etc. Hence a cell is called the functional unit of life. Additionally, the cell is the smallest unit of life and all the living beings are made up of cells. Hence a cell is called the structural unit of life.
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Because The cell is the lowest level of structure capable of performing all the activities of life. All living things are made up of cells. Cells are the smallest working unit of all living things.
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