1. Circulatory system—blood vessels (arteries, veins, capillaries), heart function, transport of oxygen and nutrients 2. Chemical reactions—temperature change, gas production, solid formation, identifying non-reactive substances through no change 3. Light physics—reflection from mirror, refraction in glass block, ray diagram completion, terminology use 4. Food web analysis—energy flow, 4-step food chains, bioaccumulation effects from pesticides 5. Soil and drainage—effect of sand/clay ratio on water flow, dependent variable identification, prediction based on composition 6. Temperature and dissolving—faster dissolving at higher temperatures, particle model explanation, reliable experiment design