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Biology 7 Online
OpenStudy (anonymous):

How does tobacco smoke affect the body? A. It blocks hemoglobin from binding to oxygen, thus affecting gas exchange in the lungs. B. It paralyzes cilia in the trachea allowing inhaled particles to enter the lungs. C. It causes an increase in heart rate and blood pressure. D. all of the above

OpenStudy (anonymous):

it was all above

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