HomeIBDP Biology C Interaction and Interdependence IBDP Biology C Interaction and Interdependence 1. Molecules C 1.1. Enzymes and Metabolism Start Lesson C 1.2. Cell respiration Start Lesson C 1.3. Photosynthesis Start Lesson 2. Cells C 2.1. Chemical signalling Start Lesson C 2.2. Neural signalling Start Lesson 3. Organisms C 3.1. Integration of body systems Start Lesson C 3.2. Defence against disease Start Lesson 4. Ecosystems D 4.1. Populations and communities Start Lesson D 4.2. Transferes of energy and matter Start Lesson