1. Cell level systems 1.1 Cell structure1.2 Cell division1.3 Photosynthesis1.4 Respiration1. Cell level systems1.1 Cell structure1.2 Cell division1.3 Photosynthesis1.4 Respiration2. Scaling up Premium2.1 Transport in cells2.2 Principles of organisation2.3 Plant tissues, organs and systems2. Scaling upPremium2.1 Transport in cells2.2 Principles of organisation2.3 Plant tissues, organs and systems3. Organism level systems Premium3.1 Animal tissues, organs and organ systems3.2 Homeostasis3.3 The human nervous system3.4 Hormonal coordination in humans3. Organism level systemsPremium3.1 Animal tissues, organs and organ systems3.2 Homeostasis3.3 The human nervous system3.4 Hormonal coordination in humans4. Community level systems Premium4.1 Classification of living organisms4.2 Adaptations, interdependence and competition4.3 Organisation of an ecosystem4.4 Trophic levels in an ecosystem4. Community level systemsPremium4.1 Classification of living organisms4.2 Adaptations, interdependence and competition4.3 Organisation of an ecosystem4.4 Trophic levels in an ecosystem5. Genes, inheritance and selection Premium5.1 Reproduction5.2 Variation and evolution5.3 The development of understanding of genetics and evolution5. Genes, inheritance and selectionPremium5.1 Reproduction5.2 Variation and evolution5.3 The development of understanding of genetics and evolution6. Global challenges Premium6.1 Communicable diseases6.2 Monoclonal antibodies6.3 Plant disease6.4 Plant hormones6.5 Biodiversity and the effect of human interaction on ecosystems6.6 Food production6. Global challengesPremium6.1 Communicable diseases6.2 Monoclonal antibodies6.3 Plant disease6.4 Plant hormones6.5 Biodiversity and the effect of human interaction on ecosystems6.6 Food production