1. Biology: animal cell structure and function (nucleus, cytoplasm), decomposition variables (temperature, control variables), food web identification using keys (arthropods), characteristics of living things (MRS GREN), respiration and water cycle processes. 2. Chemistry: element characteristics and substance classification (element, compound, mixture), particle diagrams, testing unknown solutions with Universal Indicator, hazard symbols, metals vs non-metals (magnetic, ductile, boiling point). 3. Physics: series circuits (lamp failure, switch, buzzer symbol), energy conversions in stretched elastic band (elastic → kinetic), anomalous results identification, motion and force concepts, sound transmission and speed in materials, sound in vacuum. 4. Earth and space: solar eclipse explanation using Sun-Earth-Moon alignment, gravitational force maintaining orbit, predicting effects of solar alignment. 5. Scientific method: control and independent variables in decomposition experiment, calculating decomposition rate from mass changes, data table completion, graph interpretation (distance vs stretch), fair testing and repeatability.