1. Revision checklist Adaptations Competition Farming methods TB in cattle Indicator species Food webs and chains Chemicals in the food chain Fertilisers – nitrates build up in water = animals suffocate Pyramids of biomass and number Carbon cycle Nitrogen cycle Genes, DNA, alleles Genetic profiling Sex chromosomes Punnett squares and key words Dominant and recessive Variation and Gregor Mendel Genetic modification (GM) Gene therapy (cystic fibrosis) Variation (continuous and discontinuous) Mutations Evolution Natural selection (e.g. In rats and bacteria)

2. Negative feedback Control of body temperature Control of blood glucose levels Plant responses (gravitropism, phototropism) Diagram of skin Health: Drugs Alcohol Smoking Food groups Drug testing

3. QWC questions How did “......................” develop this characteristic over time = How do nitrates affect aquatic animals? Temperature regulation – Sweating – Hairs / feathers – Blood vessels How would you investigate the amount of energy in different foods?