1. Nitrogen fixation: Nitrogen gas in the atmosphere is converted into ammonia by nitrogen-fixing bacteria.
2. Nitrification: Ammonia is converted into nitrites and nitrates by nitrifying bacteria.
3. Denitrification: Nitrates are converted back into nitrogen gas by denitrifying bacteria, completing the cycle.
The three steps of the nitrogen cycle in order, starting with nitrogen gas in the atmosphere, are what?
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