Why is nitrogen fixation an essential process?

Question

Quizplus · Accepted Answer

Fixed nitrogen is often the limiting factor in plant growth, as plants require nitrogen to build proteins, nucleic acids, and other essential cellular components. Nitrogen gas, which makes up 78% of the Earth's atmosphere, cannot be directly used by most plants, so they rely on fixed nitrogen sources such as protein-rich soil, fertilizers, or nitrogen-fixing bacteria. Without nitrogen fixation, plant growth and biomass production would be severely limited, which would have cascading effects throughout ecosystems.

Why Is Nitrogen Fixation an Essential Process