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1. 
Interaction between living organisms and the non-living physical environment in which they live.
2. 
The position a particular organism occupies within an ecosystem.
3. 
The place where an organism lives.
4. 
Organisms of the same species within an ecosystem.
5. 
Organisms considered to be the foundation of food chains.
6. 
Organisms that feed on other living things.
7. 
Organisms that feed on dead organic matter.
8. 
Food available for the next trophic level.