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The cardiovascular system works closely with the __ system, which takes oxygen out of the air and makes it available for our cells to use. A. Endocrine B. Excretory C. Digestive D. Respiratory
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The cardiovascular system works closely with the __ system, which takes oxygen out of the air and makes it available for our cells to use.

A. Endocrine
B. Excretory
C. Digestive
D. Respiratory

User Liam Ferris
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1 Answer

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The Answer Is Respiratory System
User Arud Seka Berne S
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7.9k points
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