Skin,hair,muscle,and enzymes are all made of protein,which is a natural polymer.Proteins are

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Proteins are made of amino acids, which are linked together by peptide bonds to form a long chain called a polypeptide. Polypeptides are considered polyamides because they contain amide bonds (-CO-NH-) between the amino acids. Polyester (A) refers to a polymer with ester bonds, while polyethylene (B) and polyalcohol (D) both refer to different types of polymers that are not commonly found in natural proteins.

Skin,hair,muscle,and Enzymes Are All Made of Protein,which Is a Natural