Final answer:
The smallest unit of biological structure that meets the functional requirements of living is the cell, which is essential for all life processes.
Step-by-step explanation:
A cell is the smallest independently functioning unit of a living organism. Each bacterium is a single cell and all living structures of human anatomy contain cells. Cells are the basic building blocks of all organisms. The smallest unit of biological structure that meets the functional requirements of "living" is the cell. A cell is the smallest independently functioning unit of a living organism, and all living structures of human anatomy contain cells.
Cells are indispensable for the processes and actions that define life, performing and initiating crucial life functions. Even bacteria, the simplest forms of life, are composed of individual cells, each being a single, independent living entity.