Plankton =
Every single plant in the wnyorld needs oxegyn if a plant didnt have oxegyn in would die.
Lungs.
Forest fires would be much worse than they are, but people would be able to climb Mount Everest without taking oxygen bottles.
Mars does have oxegyn actually, although it's really little because of the interaction between the CO2 in it's atmospere interacting with the sun. Btw people, please stop saying Mars has no oxegyn!
No, there are no gases on the moon as there is no atmosphere.
oxegyn in the air
A gas tank
2
Yes.
Air Pollution Beer Oxegyn
oxegyn and animals
Maybe but if it does it will be in very tiny amounts