Which elements are found in water?

Water is a chemical compound composed of two elements: hydrogen and oxygen. This can be represented by the chemical formula H₂O, which indicates that each molecule of water consists of two hydrogen atoms covalently bonded to one oxygen atom.

When considering the other options, nitrogen is not a part of water's chemical structure, nor is carbon; these elements do not contribute to the formation of water molecules. Therefore, the only combination that accurately reflects the composition of water is hydrogen and oxygen, establishing it as the correct answer. Understanding this fundamental aspect of water highlights its importance in both chemistry and biology, as it is vital for life and many chemical reactions.