Do yout agree that 'A cell is a building unit of on organism'. If yes, explain why?

Explanation

Yes , cell is a building unit of an organism as every living organism is made up of one or more cells. In unicellular organisms, single cell performs all the functions of life. However, in multicellular organisms, cells become specialized to form tissues , tissues form organs and various organs are grouped into organ-systems, each with a specific function. However, in all these hierarchial units, cell remains the basis building unit of the organism.