Please answer the following question: You are presented with the question "vertebrates have a complete digestive system and a closed what?" and the following answer choices: - digestive tract - lung system - the body's largest organ - circulatory system - Veins and arteries. - brain stem - all liquids - major threat to health Now knowing that chordates have a complete digestive system and a closed circulatory system and because reptiles are vertebrates, they are chordates, choose the best answer.
Answer:
circulatory system