Which in its gaseous form is not a greenhouse gas?

Name: Which in its gaseous form is not a greenhouse gas?
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Question

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Molecular nitrogen (N2) is not a greenhouse gas. While it does make up over 78% of the Earth's atmosphere, it does not absorb heat and re-emit it back to the Earth's surface, which is a defining characteristic of greenhouse gases. Water (A), carbon dioxide (B), and methane (C) are all greenhouse gases as they absorb and re-emit heat in the Earth's atmosphere.

Which in Its Gaseous Form Is Not a Greenhouse Gas