A2 Biology - Ch.23 Ecosystems

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1 / 6: A2 Biology - Factors affecting an ecosystem (OCR A Chapter 23.1)

2 / 6: A2 Biology - Trophic levels and biomass (OCR A Chapter 23.2)

3 / 6: A2 Biology - Ecological efficiency (OCR A Chapter 23.2)

4 / 6: A2 Biology - Carbon cycle (OCR A Chapter 23.3)

5 / 6: A2 Biology - Reactions in the nitrogen cycle (OCR A Chapter 23.3)

6 / 6: A2 Biology - Nitrogen cycle (OCR A Chapter 23.3)