4.3.1 Communicable diseases – Part 1

4.3.1 Communicable diseases – Part 2

4.3.1 Communicable diseases – Part 3

4.4.1 Photosynthesis (HT only)

4.4.2 Respiration (HT only)

4.5.1 Homeostasis

4.5.2 The Human Nervous System – Structure and function

4.5.3 Hormonal coordination in humans – Part 1 (HT only)

4.5.3 Hormonal coordination in humans – Part 2 (HT only)

4.6.1 Reproduction – Part 1: Sexual and Asexual reproduction

4.6.1 Reproduction – Part 2: DNA, the genome and inheritance

4.6.2 Variation and Evolution – Part 1: Variation and Evolution

4.6.2 Variation and Evolution – Part 2: Selective breeding and Genetic engineering (HT only)

4.6.3 The development of understanding of genetics and evolution – Evidence for evolution, Fossils, Extinction and Resistant bacteria

4.6.4 Classification of living organisms

4.7.1 Adaptations, interdependence and competition

4.7.2 Organisation of an ecosystem

4.7.3 Biodiversity and the effect of human interaction on ecosystems