<P> CHON is a mnemonic acronym for the four most common elements in living organisms: carbon, hydrogen, oxygen, and nitrogen . </P> <P> The acronym CHNOPS, which stands for carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur, represents the six most important chemical elements whose covalent combinations make up most biological molecules on Earth . Sulfur is contained in the amino acids cysteine and methionine . Phosphorus is contained in phospholipids, a class of lipids that are a major component of all cell membranes, as they can form lipid bilayers, which keep ions, proteins, and other molecules where they are needed for cell function, and prevent them from diffusing into areas where they should not be . Phosphate groups are also an essential component of the backbone of nucleic acids and are required to form ATP--the main molecule used as energy powering the cell in all living creatures . </P>

What is the most common element in living organisms
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