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Theory:

Our environment:
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Ecosystem classification:
eco1w958.png
Trophic levels and food web:
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Trophic levels
 
Diagram_of_Trophic_Layers_&_Energy_Transfer_in_an_Ecosystem.svg
Trophic levels and flow of energy across the ecosystem 
 
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Flow of energy across the ecosystem 
 
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Marine food web
  
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Soil food web
Waste management hierarchy:
Waste_hierarchy_rect-en.svg