1. Biology: blood components (RBC, WBC, plasma), oxygen transport, immune response, infection indicators, cell size measurement and calculation, invasive species impact (rabbits, foxes), food web effects on ecosystems. 2. Chemistry: atomic structure (proton, neutron, electron charges), atom nucleus, light color addition and filters, reactivity series (e.g. Mg + O₂ → MgO), product formation from calcium + water, unreactivity of gold, heat release in metal-acid reactions. 3. Physics: magnetic field lines between attracting and repelling poles, pressure calculation using force/area, moment principle in see-saw balance, Milky Way as a galaxy, solar system structure, electromagnetic circuit drawing (cell, coil, iron rod, switch). 4. Earth science: Earth′s magnetic field source (core), compass use for magnetic direction, internal Earth layer identification, evidence of global warming (sea level rise, glacier melting), long-term data collection importance, satellite imaging benefits. 5. Scientific skills: interpreting solubility graphs (e.g. mass vs temperature), identifying temperature of solubility equivalence, energy change classification (exothermic/endothermic), fair testing in metal reactivity, consistent measurement for comparison.