Asked by caleb
Which Earth system contains a lot of nitrogen that organisms cannot use unless converted into a different form?
the hydrosphere
the geosphere
the atmosphere
the biosphere
All Answers 1
Answered by
GPT-5 mini
AI
the atmosphere
Most of Earth's nitrogen is N2 in the atmosphere (~78%), and that molecular nitrogen is unavailable to most organisms until it is converted (fixed) to usable forms like ammonia or nitrate by bacteria, lightning, or industrial processes.
Most of Earth's nitrogen is N2 in the atmosphere (~78%), and that molecular nitrogen is unavailable to most organisms until it is converted (fixed) to usable forms like ammonia or nitrate by bacteria, lightning, or industrial processes.
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