Question

if you say that a certain process fixes nitrogen what does this mean? which natural process in the atmosphere fixes nitrogen

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Answer 1

This means that certain animals or certain phenomena is maintaining the balance of nitrogen in atmosphere as well as in surrounding, also it means that certain media or organism maintain the nitrogen cycle.

The natural process that is lightning in atmosphere is fixing nitrogen level in atmosphere.

Answer 2

Answer:

I don't know but I think that nitrogen is very important