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Calling it "inert" is misleading. It's involved in all kinds of chemical reactions that are essential for life (and lots of non-biological reactions, too). It's only inert in the sense that most living things can't use it directly from the air and rely on nitrogen-fixing plants and bacteria to make it into molecules we can use.
Sure, I understand it’s one of the 3 basic plant fertilizers and plays a role in human biology. I’m referring nitrogen as a gas and its role in human respiration. It’s commonly referred to as an inert gas. I think that mainly refers to respiration and combustion.