1. Water Cycle and Purification – Identification of evaporation, transpiration, and condensation processes; methods of making seawater drinkable. 2. Endocrine System and Hormones – Functions of adrenal glands, insulin regulation, testosterone effects, and homeostasis maintenance. 3. Photosynthesis and Plant Growth – Importance of carbon dioxide, adaptations of pine trees, and hormone effects on shoot direction. 4. Circulatory System and Exercise – Comparison of artery and vein walls, function of valves, effects of exercise on endurance, and causes of muscle cramping. 5. Respiration and Metabolism – Differences in oxygen consumption between germinating and dried peas, role of mitochondria, and osmosis effects on potato cells. 6. Ecosystems and Food Chains – Impact of slug removal on the food chain, biomass calculations, nitrogen cycle contributions, and benefits/drawbacks of biofuel crops.