Please answer the following question: Chordates have a complete digestive system and a closed circulatory system, and because reptiles are vertebrates, they are chordates. Given these facts, vertebrates have a complete digestive system and a closed what among the following options: - digestive tract - lung system - the body's largest organ - circulatory system - Veins and arteries. - brain stem - all liquids - major threat to health
Answer:
circulatory system