Biology (Combined Science) · IGCSE · Edexcel · Pearson Edexcel International GCSE Science (Double Award) — Biology (Modular) — 4XSD1 · Specification point · 5.7 · Ecology and the environment · Feeding relationships
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| Learners should: |
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5.7 understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer |