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Ecological Succession: Levels of Organization

Across
All of the populations that live in the same area
Living things
The diversity of living things
The part of Earth where all life exists; consists of many different biomes
Non-living things
Down
Organisms of the same species that live in the same area
A species that plays an especially important role in its community
All living and non-living things in a given area
A living thing made up of one or more organ systems
A group of similar ecosystems