A2 level Biology notes Unit 4- Populations and the Environment 1. Populations 3 1.1 Populations and ecosystems 3 1.2 Investing populations 3 1.3 Variation in population size 5 1.4 Competition 6 1.5 Predation 8 1.6 Human populations 10 2. ATP 12 2.1 Energy and ATP 12 3. Photosynthesis 14 3.1 Overview of Photosynthesis 14 3.2 The Light- dependent reaction 16 3.3 The Light Independent…
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