You are presented with the quiz "An animal requires what for survival?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an animal requires nutrients for survival" and "water is the most important nutrient for animals and humans". So, what's the best answer to the question?

OPT: -- a pillow; -- a collar; -- a leash; -- stamina; -- water; -- protein; -- food; -- Enzymes;
Answer:
water