Multiple Choice
What helps maintain global oxygen concentrations in the troposphere?
A) Oxygen levels remain balanced by photosynthesis and cellular respiration.
B) Photosynthesis replaces oxygen loss to air pollutants like NOx, SOx, and ozone.
C) The burning of fossil fuels since the Industrial Revolution has helped maintain oxygen concentrations in the atmosphere.
D) Excess oxygen is broken down by ozone in the upper atmosphere.
Correct Answer:
Verified
Correct Answer:
Verified
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