Final answer:
The least complex level of biological organization is represented by the hydrogen atom.
Explanation:
The item that represents the least complex level of biological organization is the hydrogen atom.
The hierarchy of biological organization from the smallest to the most encompassing is as follows: organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, and biosphere.
In this hierarchy, the hydrogen atom is at the lowest and simplest level.
Learn more about biological organization levels here:
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