I only know one importance why nitrogen exist. There may be other importance to it but I have not heard it. Same, this answer is going to be used by my common sense and brain plus things I heard from and saw at the Internet.
Nitrogen is for plants. That’s the answer! I don’t know much other things! Why does plants need nitrogen? Maybe, you should search it at google. I just answer with, what I said so earlier. I hope this answer helps you! 😀
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