1. Human biology and gas exchange: alveoli structure and adaptation (diffusion surface), oxygen-rich blood region, iron for red blood cells
2. Chemical reactions: magnesium with oxygen and hydrochloric acid, product identification, Bunsen burner safety, control of risks
3. Electromagnetism: variable current effect on pin attraction, anomaly recognition, alternative strength factors
4. Space science: solar system, galaxy, stellar dust, satellites, part-description matching
5. Ecology and bioaccumulation: food chain concentration increase (e.g. otters), habitat identification, toxic buildup explanation, ecological impact
6. Dissolving and concentration: particle model diagrams, solute vs solvent identification, solution darkness related to concentration