• Photosynthesis uses light energy to convert CO2 and H2O into glucose and O2
• Light-dependent reactions occur in the chloroplast's thylakoids and produce ATP, NADPH, and O2
• The Calvin Cycle is the light-independent phase of photosynthesis and creates glucose from CO2, ATP, and NADPH
• Cellular respiration breaks down glucose to produce CO2, water, and ATP energy
• ATP production in cellular respiration involves glycolysis, citric acid cycle, and electron transport chain

Overall, photosynthesis and cellular respiration are essential for producing energy and maintaining the balance of gases in the atmosphere.