How is the cell structural and functional unit of life?

The cell is the structural unit of life because all living organisms are made up of one or more cells. In multicellular organisms, similar cells form tissues, tissues form organs, and organs work together to form organ systems.

The cell is the functional unit of life because all basic life processes occur inside cells. The cell membrane controls the movement of substances in and out of the cell, the cytoplasm contains organelles, the nucleus controls cellular activities, mitochondria release energy, and other organelles perform specific functions. Therefore, the cell is the basic unit of both structure and function in living organisms.