Question

why is oxygen required?​

Answer 1

To stay alive

We breathe because oxygen is needed to burn the fuel [sugars and fatty acids] in our cells to produce energy.)

Answer 2

Answer:

Everyday functions of the body like digesting your food, moving your muscles or even just thinking, need oxygen. When these processes happen, a gas called carbon dioxide is produced as a waste product. The job of your lungs is to provide your body with oxygen and to get rid of the waste gas, carbon dioxide.