What has a nervous system?\nOptions:\n- (A) Nerve tonic\n- (B) Jellyfish\n- (C) Air\n- (D) fur seals\n- (E) Cardiovascular system\n- (F) animals\n- (G) chickens\n- (H) elephants Let's solve this problem gradually.

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Most invertebrates have a nervous system. Jellyfish and insects are invertebrates. Jellyfish have a nervous system. So the final answer is (B).
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