
Nitrogen
Common Gas
Nitrogen is invisible and non-reactive at room temperature, unlike oxygen which supports combustion.

Despite being so common, nitrogen does not burn or support fire.
Invisible but Crucial
Nitrogen is essential for living organisms to create proteins, although we cannot see or smell it.

Plants absorb nitrogen from the soil to grow.
Used in Phrases
The phrase 'nitrogen cycle' refers to the continuous movement of nitrogen in different forms in nature.

The nitrogen cycle is a key concept in understanding ecology.
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Gas
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