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    Principles of Life
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    Exam 31: Breathing
  5. Question
    At Sea Level,O<sub>2</sub> Makes Up About _______ Percent of the Gas
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At Sea Level,O2 Makes Up About _______ Percent of the Gas

Question 71

Question 71

Multiple Choice

At sea level,O2 makes up about _______ percent of the gas molecules in the air.


A) 1
B) 15
C) 21
D) 70
E) 100

Correct Answer:

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