Final answer:
The smallest unit of biological structure that meets the fictional requirements of living is a cell. It is the basic building block of life and all living structures, including organs and organelles, are composed of cells.
Step-by-step explanation:
The smallest unit of biological structure that meets the fictional requirements of living is a cell. A cell is the smallest independently functioning unit of a living organism.
It is the basic building block of life and all living structures, including organs and organelles, are composed of cells.