The three steps of the nitrogen cycle in order, starting with nitrogen gas in the atmosphere, are (1 point)

Question

O nitrogen fixation, nitrification, and denitrification.
• denitrification, nitrification, and nitrogen fixation.
O nitrogen fixation, denitrification, and nitrification.
O nitrification, nitrogen fixation, and denitrification.
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Answer 1

The correct order of the steps in the nitrogen cycle, starting with nitrogen gas in the atmosphere, is:

Nitrogen fixation, nitrification, and denitrification.

1. Nitrogen fixation: Nitrogen gas (N₂) from the atmosphere is converted into ammonia (NH₃) by certain bacteria.
2. Nitrification: Ammonia is then converted into nitrites (NO₂⁻) and then into nitrates (NO₃⁻) by nitrifying bacteria.
3. Denitrification: Nitrates are converted back into nitrogen gas, returning it to the atmosphere.

So, the first option is the correct one.