1 Smoking and drinking interfere with your body's ability to process oxygen.
2 Qualitative analysis shows that water is made up of hydrogen and oxygen.
3 Hydrogen and oxygen combine to form water.
4 There was a risk the brain might be starved of oxygen.
5 The molecules of oxygen gas contain just two atoms.
6 When an element is caused to combine with oxygen it is oxidized.
7 Fish take in oxygen through their gills.
8 If headaches only occur at night, lack of fresh air and oxygen is often the cause.
9 Ozone is a highly reactive form of oxygen gas.
10 Trees absorb carbon dioxide and produce oxygen.
11 Plants and trees filter carbon dioxide out of the air and produce oxygen.
12 If it were not for oxygen and nitrogen in the air, no man could live on the earth.
13 The aorta is the main artery that carries blood with oxygen out of the heart to the body.
14 Hydrogen and oxygen are gases.
15 Suffering from hypothermia and a lack of oxygen they'd appeared doomed.