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  [ A level ecology ]
 
Energy flow through ecosystems
 
Ecosystems
  Simple games to test knowledge of ecology definitions

 
Environmental biology - ecosystems
  Page from an online biology textbook including energy flow and cycles

 
Food chains
  Information on food chains, webs, pyramids etc.

 
The flow of energy
  Article on energy flow and trophic levels.

 
The sun is a mass of incandescent gas
  A gigantic nuclear furnace.....