Which best describes the relationship between the circulatory system and the respiratory system?
a. the circulatory system is the transport system for the respiratory system.
b. the respiratory system is the transport system for the circulatory system.
c. the circulatory system diffuses red blood cells into the respiratory system to pick up oxygen.
d. the respiratory system transfers hemoglobin to the red blood cells of the circulatory system.
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Which best describes the relationship between the circulatory system and the respiratory system?
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