B.
A is false because then the younger you are the higher your heart rate.
C is false because heart rate must be a whole number.
D is obviously wrong.
Answer:
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Answer:
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The blood (circulatory system) carries oxygen to your lungs (respiratory system). Oxygen binds to the hemoglobin molecule in your blood and is carried back to the heart, then pumped out to the other parts of the body.
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