I think it is 3 because Sus wiw word if rn
Structure of an Amino Acid. Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure , which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH 2), a carboxyl group (COOH), and to a hydrogen atom.
Manipulation of the independent variable should change the dependent variable, the value of which "depends" on the independent variable's change in value.