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HURRY PLZ 40 POINTS
Which statement best explains why blood is “waste-rich” when it returns to the heart?
The blood has a high concentration of oxygen and a low concentration of carbon dioxide.
The blood has a high concentration of oxygen and a low concentration of hemoglobin.
The blood has a high concentration of carbon dioxide and a low concentration of oxygen.
The blood had a high concentration of hemoglobin and a low concentration of oxygen

Sagot :

Answer:

the blood has a high concentration of hemoglobin and a low concentration of oxygen

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