Biology summaries Year 2 · Clear summaries in English 1 · Cellular respiration and breathing1.1Metabolism→1.2Cellular respiration→1.3The respiratory system→1.4Breathing→1.5Healthy airways→1.6Gas exchange in animals→2 · Nutrition and digestion2.1Foods and nutrients→2.2The digestive system→2.3Digestive organs→2.4Healthy eating→2.5Food spoilage→2.6Feeding and digestion in mammals→3 · Circulation3.1Blood→3.2The circulatory system→3.3The heart→3.4Excretion→3.5The immune system→3.6Healthy living→4 · Reproduction and sexuality4.1Reproductive organs→4.2Puberty→4.3Becoming fertile→4.4Becoming pregnant→4.5Sexuality→4.6Safer sex→5 · Inheritance and evolution5.1Genotype and phenotype→5.2Chromosomes→5.3Genes and alleles→5.4The theory of evolution→5.5The history of life on Earth→5.6DNA technologies→6 · Ecology and sustainability6.1Organisms and their environment→6.2Food relationships and cycles→6.3Living together→6.4Nature management→6.5People and the environment→6.6Sustainability→
