The largest group among the options provided is a biome.
To clarify the hierarchy:
- Population: A group of individuals of the same species living in a specific area.
- Community: All the populations of different species that live in the same area and interact with each other.
- Ecosystem: A community along with its physical environment (abiotic factors).
- Biome: A large geographic biotic unit, a major community of plants and animals with similar life forms and environmental conditions, typically defined by factors like climate and vegetation types.
So, in terms of size from smallest to largest, the order is: population < community < ecosystem < biome.
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