Which elements are found in skin and hair?

Skin and hair are primarily composed of proteins, which are made up of amino acids. The main elements that constitute these amino acids include carbon, nitrogen, oxygen, and sulfur.

Carbon is a fundamental building block of proteins and is present in the structure of amino acids. Nitrogen is crucial as it is part of the amine group in amino acids, making it essential for the formation of proteins found in the hair and skin. Oxygen is often found in the carboxyl groups of amino acids and is also a component of water, making it an important element for maintaining the moisture and health of the skin and hair. Sulfur plays a significant role in forming disulfide bonds, which help to stabilize the structure of keratin, the main protein in hair.

This combination of elements is fundamental to the biology of skin and hair, reflecting their structural and functional properties. The other options do contain elements that may have various roles in the body, but they do not accurately represent the primary components found in hair and skin.