Biology—organ functions, respiration (aerobic/anaerobic), photosynthesis, food chains, energy transfer, inherited variation, selective breeding, environmental adaptation, seedling growth factors Chemistry—acid reactions, pH and indicators, separation methods, combustion, salt formation, displacement reactions, hydrogen test, corrosion protection, state changes Physics—force diagrams, speed calculation, balanced forces, energy transfer (Sankey), heat insulation, temperature/time graphs, reflection, refraction, lens diagrams Earth Science—acid rain effects, fossil fuel combustion, bioindicators (lichens), igneous/sedimentary/metamorphic rocks, environmental change on organisms Scientific method—dependent/independent variables, fair test principles, data reliability, graph interpretation, anomalous results, investigation improvement