Living beings primarily breathe in oxygen to survive. This essential gas is critical for cellular respiration, a process by which cells convert glucose and oxygen into energy, producing carbon dioxide and water as byproducts. While plants release oxygen through photosynthesis, animals, including humans, rely on this oxygen for various metabolic processes. Though we inhale a mixture of gases, with nitrogen comprising the majority of Earth's atmosphere, oxygen is the vital component that fuels our biological functions. The importance of oxygen has led to its study in various fields, including medicine and environmental science.