Here's why:
* Cellular respiration is the process by which cells break down glucose (sugar) in the presence of oxygen to produce energy (ATP).
* Oxygen acts as the final electron acceptor in the electron transport chain, a key step in cellular respiration.
* When oxygen accepts electrons, it combines with hydrogen ions (H+) to form water (H2O). This is the reason we exhale carbon dioxide and water as byproducts of respiration.
In summary: Oxygen is essential for the complete breakdown of glucose in cellular respiration, and it is consumed during this process.
