they are found in math problems
Water contains hydrogen and oxygen. Sugar contains carbon, hydrogen and oxygen.
Hydrogen, carbon, and oxygen.
Carbon, Hydrogen, and Oxygen.
hydrogen, oxygen, carbon and i think the 4th is sulphur
Carbon, Oxygen, Hydrogen
carbon oxygen hydrogen
carbon, hydrogen, and oxygen
hydrogen, helium, oxygen.
In the element oxygen.
Carbohydrates are made of carbon, hydrogen and oxygen.
carbon, hydrogen, nitrogen, oxygen, phosphorus
iodine, hydrogen, oxygen, and other halogens oxygen, hydrogen, iodine, and other halogens