Possible answers: 1). they body they live in; 2). solid, liquid, gas; 3). heating liquids; 4). protect them; 5). electrical energy; 6). objects that have mass; 7). biodiversity; 8). an object;

You are presented with the quiz "What can an animal's movement be changed to" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when an animal moves , chemical energy is converted to mechanical energy" and "mechanical energy can be changed to electrical energy". So, what's the best answer to the question?
Answer:
5).