Great question! Let me walk you through the light reactions step by step. 1. Light absorption — Chlorophyll in Photosystem II absorbs photons, exciting electrons to a higher energy state. 2. Water splitting — To replace those lost electrons, water molecules are split: 2H₂O → 4H⁺ + 4e⁻ + O₂. This is where the oxygen we breathe comes from. 3. Electron transport chain — The excited electrons pass through a series of proteins, releasing energy that pumps H⁺ ions across the thylakoid membrane. Want me to continue with steps 4–6, or should I explain any of these in more detail?