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![C4.2 Energy Flow Through Trophic Levels [IB Biology SL/HL]](https://i.ytimg.com/vi/THl10RlEPFU/maxresdefault.jpg)
![C4.2 Energy Flow Through Ecosystems [IB Biology SL/HL]](https://i.ytimg.com/vi/8vRkGP1JXuc/maxresdefault.jpg)
