IB Biology — Topic 3.9

Transfers of energy and matter

C4.2

Sub-topics in Topic 3.9

3.9.1Modes of nutrition & autotrophs vs heterotrophs3.9.2Food chains, food webs & trophic levels3.9.3Energy losses & pyramids of energy3.9.4Pollutants in food chains: bioaccumulation & biomagnification3.9.5The carbon cycle3.9.6Decomposers & nutrient cycling

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