| Topics | Subtopics | |
| 1 | Photosynthesis and the carbon cycle | 1.1 Photosynthesis |
| 1.2 More about photosynthesis | ||
| 1.3 The carbon cycle | ||
| 1.4 Climate change | ||
| 2 | Maintaining life | 2.1 Plants and water |
| 2.2 Transpiration | ||
| 2.3 Excretion in humans | ||
| 2.4 Keeping a fetus healthy | ||
| 3 | Genes and inheritance | 3.1 Chromosomes, genes and DNA |
| 3.2 Gametes and inheritance | ||
| 3.3 Variation | ||
| 3.4 Natural selection |