Interacting With Other Species
The smallest unit of ecological organization is an individual organism. This could be a single plant or animal that interacts with its living and non-living environment within a specific ecosystem.
A cell is the smallest unit of an organism
OrganismPopulationCommunityEcosystem
A citizen, who voluntary self-identifies as a party member, functions as the smallest unit of the party organization.
Interacting With Other Species
Species
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organ, or unit e.g. a flower Population
The cell is the level of organization that is the smallest unit of life. Cells working together make tissues.
The smallest functional unit of the biosphere is an ecosystem. Ecosystems consist of living organisms interacting with each other and their physical environment, functioning as a self-contained unit where energy and nutrients are exchanged. They can vary in size from a small pond to a large forest.
Organism, population, community, ecosystem, biome, biosphere.