Why does our body need oxygen?

Hint: The fuels like sugar and fatty acids in our bodies need oxygen to be burned. Furthermore, oxygen is transported to our lungs through breathing, where it is transmitted to the rest of the body by our red blood cells. It is essential for our bodies to function.

Complete Answer:
In cellular respiration, oxygen is essential for creating energy. Cellular respiration is a complicated biological process that breaks down carbohydrates, fats, and proteins and converts them to energy for the organism's survival. When electrons liberated during respiration are carried across the inner membranes of the cells, oxygen is required at the end of the process.
The glucose reacts with oxygen to produce carbon dioxide and water. Electron transport, which generates up to 28 ATP-32 ATP, is one of the most valuable energy resources where oxygen acts as an electron acceptor.

Note:
Because most living things rely on oxygen to breathe and live, the oxygen content in our planet's water is also affected. The environment is richer and more resilient when there is more solved oxygen in lakes, rivers, and seas. Oxygen may help with decomposition, and it's commonly used to help clean up dirty rivers and lakes by injecting the gas into the water!