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Levels of Organ.
Levels of Organization
| Term | Definition |
|---|---|
| Levels of Organization | structures in nature, with things at higher levels being composed of things at the next lower level |
| atom | the smallest unit within the levels of organization |
| molecules | composed of atoms |
| cells | composed of molecules and are the smallest unit of life |
| tissue | composed of groups of cells |
| organs | composed of tissues |
| organ system | composed of organs |
| organism | composed of organ systems |
| population | composed of the same type of organism in the same area |
| community | composed of populations that live together is the same area |
| ecosystem | composed of a community and its non-living factors |
| biome | a community of plants and animals that have common characteristics for the environment they exist in |
| biosphere | he worldwide sum of all the ecosystems |