Multiple choice

Which of the following options is a greenhouse gas?

  1. O2

  2. N2

  3. CO2

  4. CO

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide (CO2) is a greenhouse gas that absorbs and re-emits infrared radiation, trapping heat in the atmosphere. Oxygen (O2) and nitrogen (N2) make up most of the atmosphere but do not trap heat effectively. Carbon monoxide (CO) is not classified as a major greenhouse gas like CO2.

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