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The lungs and respiratory system work closely with the ___________ system to make sure oxygen reaches all the cells of our body. A) circulatory B) digestive C) integumentary Eliminate D) nervous

User Estare
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the answer would be the circulatory system.
User Peony
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The correct answer would be the A.) circulatory system. Your heart works hard to pump oxygen rich blood to the rest of your body through arteries. When the blood becomes low on oxygen, it is pumped back to your heart and to your lungs to become oxygenated once again.
User Qwertymk
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