Oxygen Makes Up 21 Percent of the Gas in the Atmosphere.Why

question 93

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.

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