What topic do all scientific methods have in common

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

answer; i believe that the correct answer is (light);

not sure if this is what you'r looking for nnew= nold

69 is the correct math for the amino acids