The correct answer is D. Carbon, Hydrogen, Oxygen and Nitrogen.
Amino acids are the building blocks of proteins. They are made up of carbon, hydrogen, oxygen, and nitrogen atoms. The order of these atoms in an amino acid determines its unique properties. There are 20 different types of amino acids, and they are all essential for life.
Carbon is the most abundant element in organic compounds, and it is the backbone of amino acids. Hydrogen is also found in all amino acids, and it helps to stabilize the structure of the molecule. Oxygen is found in most amino acids, and it helps to form the peptide bonds that link amino acids together. Nitrogen is found in all amino acids, and it is essential for the formation of the peptide bonds that link amino acids together.
The four major elements of amino acids are carbon, hydrogen, oxygen, and nitrogen. These elements are essential for the structure and function of amino acids.