Answer:
Amino acid
Explanation:
The basic building block of a protein is called an amino acid. There are 20 amino acids in the proteins you eat and in the proteins within your body, and they link together to form large protein molecules.
They are made of DNA so it's B
Metabolism: all chemical reactions within a cell
I would say man made but not to sure with out answer choices..
Coordination because with out that u can't do anything
