Question

Why do we need only oxygen

Answer 1

hola there,

♾♾♾♾♾♾♾♾♾♾♾♾♾♾♾
we breathe because oxygen is needed to burn the fuel sugars and fatty acids in our cells to produce energy

Answer 2

We need only oxygen because it oxidise our food in the process of cellular respiration,thus releasing energy,which is eventually stored as ATP(Adenosine triphosphate) in the electron transport chain in mitochondria and in glycolysis in the cytoplasm.Oxygen is a very important element because we need it to live.Many living organism including human being need oxygen to live and breathe.