The smallest group among the options provided is "population."
Here’s a brief explanation of the terms to clarify:
- Population: A group of individuals of the same species living in a specific area at the same time.
- Community: All the different populations (species) that live and interact in a particular area.
- Ecosystem: A community along with its physical environment (abiotic factors, such as soil, water, climate).
- Biome: A larger ecological classification that includes multiple ecosystems that share similar climate conditions and types of organisms.
Therefore, the correct answer is population.
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