G What is the purpose of building a H+ concentration gradient inside of the thylakoid? Group of answer choices the flow of H+ out of the thylakoid against their concentration gradient powers ATP synthase the flow of H+ out of the thylakoid down their concentration gradient powers chlorophyll molecules the flow of H+ out of the thylakoid down their concentration gradient powers enzymes that create NADPH the flow of H+ out of the thylakoid down their concentration gradient powers ATP synthase