Multiple Choice
Oxygen makes up 21 percent of the gas in the atmosphere.Why is oxygen not considered a greenhouse gas?
A) It is used in respiration.
B) It is used in photosynthesis.
C) It does not trap heat in the atmosphere.
D) It is present in too high a concentration.
E) It is present in too low a concentration.
Correct Answer:

Verified
Correct Answer:
Verified
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