Which statement best describes the composition and function of proteins in organisms?

I'm in class so this is like a short answer. I know for sure that the composition of proteins is amino acids. Amino acids are found in all proteins. Proteins help stabilize the body by allowing muscles to regenerate and stay firm while giving essential nutrients to the brain and other organs. Hope this helps!

These are compounds that are composed of chains of amino acids that are crucial in DNA-coding during the processes of cell division. They are considered as the building blocks of life and are in every cell of organisms. Humans depend on protein from food sources, mostly meat and poultry, which are responsible for repair and energy in muscles. 

Hope I helped :)