C. is the correct answer - <span>The sequence of amino acids in the polypeptide chain
Amino acids are subunits of proteins, they are the monomer ( building blocks) of proteins also called polypeptides. Each protein has a unique set of amino acids chain that make them distinctive.</span>
The answer is A) Density and temperature. Hope it helps and I am 99% sure it is right.
It increases by the population growth whic causes more variation