Final answer:
The answer explains the smallest unit of biological structure, the hierarchy of biological organization, and the lowest complexity level of living things.
Explanation:
The smallest unit of biological structure that meets the functional requirements of 'living' is a cell.
From the most complex to the least complex level, the hierarchy of biological organization is represented by the sequence: organelle, tissue, biosphere, ecosystem, population.
Cellular level is the lowest complexity level of living things.
Learn more about biological organization levels here:
https://brainly.com/question/29130629
