1. The problem involves understanding the chemical relationships between the pairs: O2 and ATP, CO2 and H2O, ATP and H2O, CO2 and O2. 2. Let's analyze each pair: - O2 and ATP: Oxygen (O2) is used in cellular respiration to help produce ATP (adenosine triphosphate), the energy currency of the cell. - CO2 and H2O: Carbon dioxide (CO2) and water (H2O) are products of cellular respiration and reactants in photosynthesis. - ATP and H2O: ATP hydrolysis involves water (H2O) breaking down ATP to release energy. - CO2 and O2: Carbon dioxide and oxygen are gases involved in respiration and photosynthesis, often exchanged in biological systems. 3. These pairs represent key components in biological energy and gas exchange processes. No explicit math or graphing is required here, so no function or plot is provided.