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Tools Window Help Go View Edit File Preview Unit 2 Exam Review PPT 1.(2)-ppt (page 19 of 24) Q Search 18. Functions of the re
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The answer is the option D.all of the above ,because the respiratory system in which exchanging the gases means O2 and CO2 by inhalation and exhalation.

By the respiratory system the oxygen is provided to all living cells and provide oxygen to the blood through the lungs and carrying CO2 out of the body.

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