0 a chemical element that is a gas with no smell or colour. Oxygen forms a large part of the air on earth, and is needed by animals and plants to live.
1 a colorless gas, one of the chemical elements, that forms a large part of the air on earth and is needed to keep most living things alive and to create fire
Mountain climbers use oxygen when they reach higher altitudes.
Plants are the main source of atmospheric oxygen.
The symbol for oxygen is O2.
Broken bones, organ damage, shock, lack of oxygen, and extreme cold all reduce your chances of survival.
Laughing is good for your brain and your heart because they need a lot of oxygen to work well.
