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    Essentials of Anatomy and Physiology
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    Exam 15: The Respiratory System
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    Which of the Following Is the Most Abundant Gas in the Air
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Which of the Following Is the Most Abundant Gas in the Air

Question 78

Question 78

Multiple Choice

Which of the following is the most abundant gas in the air?


A) oxygen (O2)
B) nitrogen (N2)
C) water vapor (H2O)
D) carbon dioxide (CO2)
E) hydrogen (H2)

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