1. Effect of Caffeine on Heart Rate – Investigation of how caffeine influences the heart rate of zebrafish, including data analysis and ethical considerations. 2. Gas Exchange in Single-Celled Organisms – Explanation of why Valonia ventricosa does not require specialized gas exchange structures. 3. Glucose Uptake and Osmotic Balance – Analysis of how different glucose-to-glycogen ratios affect cell mass due to osmosis. 4. Active Transport in Red Blood Cells – Justification of active transport involvement in brilliant cresyl blue (BCB) uptake at varying temperatures. 5. Macronutrient Composition in Mammal Diets – Comparison of carbohydrate, lipid, and protein intake across different mammal species. 6. Atherosclerosis and Blood Pressure – Explanation of how high blood pressure contributes to arterial plaque formation and cardiovascular disease risk.