Answer:
B. lungs
Explanation:
circulatory system is composed of the heart, the blood, and a closed system of blood vessels.
heart
heart is the part of circulatory system to help boddy system
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Answers & Comments
Answer:
B. lungs
Explanation:
circulatory system is composed of the heart, the blood, and a closed system of blood vessels.
Answer:
heart
Explanation:
heart is the part of circulatory system to help boddy system