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The ‘cell’ is the smallest structural unit of living matter that is capable of functioning independently.As bricks assemble to make a building, cells assemble to make the body of every organism hence is called as basic building block of life . A group of cells form a tissue which performs a specific function, A group of tissue forms an organ and in the same way a group of organs form an organism. therefore cells are responsible for every vital function of our body hence, cell are called structural unit of living organisms