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    Biology
  3. Study Set
    Principles of Human Physiology
  4. Exam
    Exam 17: The Respiratory System: Gas Exchange and the Regulation of Breathing
  5. Question
    What Percentage of Air Is Oxygen
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What Percentage of Air Is Oxygen

Question 80

Question 80

Multiple Choice

What percentage of air is oxygen?


A) 21%
B) 12%
C) 6%
D) < 1%
E) 79%

Correct Answer:

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