Multiple Choice
Which of the following statements concerning the composition of the atmosphere is true?
A) Water consistently is the gas present in the highest concentrations.
B) N2 and O2 concentrations tend to be variable.
C) CO2 is present in the lowest concentration of all gases.
D) Methane concentration is about 17 parts per million by volume.
E) Carbon monoxide concentration is 388 parts per million.
Correct Answer:
Verified
Correct Answer:
Verified
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