1. human skeleton function and parts (protection, support, movement, names of bones), chemical vs physical change identification 2. heart rate and exercise analysis, bar chart interpretation, health benefits of exercise, methods for improving investigation reliability 3. ray diagram for vision, light reflection description, particle model explanation (liquid shape, solids that flow), states of matter and changes 4. food chain roles (herbivore, predator, prey), Solar System components (orbit, planets, day and night explanation), astronomical object identification 5. energy concepts (conservation, transfer, destruction), circuit behavior (lamp brightness factors), electrical component use, investigation method reasoning 6. Solar System structure, size-time relationship in melting solids, model interpretation (patterns and predictions), particle model in everyday phenomena