The cell is considered the functional unit of life because it is the smallest unit capable of performing all essential life processes, such as metabolism, respiration, and excretion. In a multicellular organism, the overall physiological activity and survival of the organism depend on the collective activities and specialized tasks performed by its individual cells. Therefore, the total function of the organism is the aggregate (or sum total) of the functions carried out by its constituent cells.
Option A describes the cell as a structural unit (the "building blocks") rather than explaining its role as a functional unit.
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