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ARC-Easy / Mercury_SC_405020 / Oxygen-rich blood returns from the lungs to the heart. Which two systems are…

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question

Oxygen-rich blood returns from the lungs to the heart. Which two systems are most directly involved in this process?

choices

  • excretory and digestive
  • circulatory and excretory
  • digestive and respiratory
  • respiratory and circulatory

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