It is like Humans we need it to breath so it is like the same concept for them if you get me. But it leads onto another question.... Why is the sun burning when there is no oxygen in space?
From the air. The air consists of 78% nitrogen and 21% oxygen. The other 1% is made of argon, carbon dioxide and other gases.
The oxygen is kept replenished when green plants photosynthesise. This...