(1). organs; (2). Acids; (3). Energy; (4). Energy.; (5). molecules; (6). hydrocarbons; (7). cell walls; (8). waters;
Given those answer options, answer the question: You are presented with the quiz "Fatty acids that circulate in the blood may contain other what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "lipids may consist of fatty acids alone, or they may contain other molecules as well" and "lipids are the fats that circulate in blood". So, what's the best answer to the question?
A:
(5).