Biology · IGCSE · Edexcel · Pearson Edexcel International GCSE (9–1) Biology (Modular) — 4XBI1 · Specification point · 5.11B · Ecology and the environment · Cycles within ecosystems
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5.11B 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) |