What do animals use as a food course?\nOptions:\n- (A) it keeps an organism warm\n- (B) water\n- (C) Generating heat\n- (D) Organic compounds\n- (E) deadwood\n- (F) light energy\n- (G) other living things\n- (H) inorganic OK. Let's think hard:
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Heterotrophs get food by eating other living things. Animals are heterotrophs, or other-feeders. Animals get food by eating other living things.
So, the final answer is (G).
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