IGCSE Edexcel Biology (9-1) Cycles within ecosystems

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards.

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© Cycles within ecosystems

4.10 describe the stages in the carbon cycle, including respiration, photosynthesis, decomposition and combustion
4.11B describe the stages in the nitrogen cycle, including the roles of nitrogen-fixing bacteria, decomposers, nitrifying bacteria and denitrifying bacteria (specific names of bacteria are not required)