Let's think step by step! What do all vertebrates have?\nOptions:\n- (A) sensory neurons\n- (B) characteristics\n- (C) a complete digestive system\n- (D) Veins and arteries.\n- (E) sub-units of species\n- (F) wings and feathers\n- (G) gills\n- (H) gizzard
The thinking starts now:
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Chordates have a complete digestive system and a closed circulatory system. All chordates are vertebrates. Vertebrates have a complete digestive system and a closed circulatory system. The final answer: (C).
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