CAIE Checkpoint Science – Biology: Living Things in Their Environment — covers ecology concepts (habitats, communities, abiotic and biotic factors, biodiversity, ecosystems), food chains, webs, and trophic levels, fieldwork techniques for studying plants and animals, plant and animal adaptations to daily, seasonal, desert, mountain, aquatic, and feeding conditions, including survival strategies such as migration, hibernation, camouflage, and specialised feeding structures.