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
Let's think step by step below.
(C)
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.

.

Therefore, the answer is (C)