Choose your answer from: i. Veins and arteries.. ii. lack of backbone. iii. bruised brain stem. iv. critical organs. v. closed circulatory system. vi. incomplete circulatory system. vii. characteristics. viii. sensory neurons.

Fact 1: Chordates have a complete digestive system and a closed circulatory system. Fact 2: Vertebrates are members of of a larger group, the chordates . Given the two facts above, vertebrates have a complete digestive system and a what?
Answer:
v.