When two or more atoms bond together, they are called molecules. Examples include water (H2O - two atoms of hydrogen and one of water), carbon dioxide (C02 - one atom of carbon and two atoms of oxygen)
the smallest particle of a substance; molecules are made up of one or more atoms. (Back to "Warning, the rays of the sun can be dangerous") (Back to "The Hole in the Ozone Layer")
the smallest single components of all living things that make up the structure of cells and tissues and perform all the life processes of the cells and the body.