Final answer:
Nitrogen fixation is the initial step in the nitrogen cycle, converting atmospheric nitrogen into usable forms for plants through the action of nitrogen-fixing bacteria.
Explanation:
Nitrogen fixation is the first step in the nitrogen cycle that converts atmospheric nitrogen into a form that plants can use. This process is carried out by nitrogen-fixing bacteria that convert N₂ into ammonia.
After nitrogen fixation, the subsequent steps include nitrification where ammonia is oxidized to nitrite and nitrate, and then denitrification where nitrates are converted back to nitrogen gas, completing the cycle.
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