Multiple choice

Which of the following options helps to reduce complex form of nitrogen back to elemental form?

  1. bacteria

  2. fungi

  3. virus

  4. algae

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Denitrifying bacteria convert nitrates and other complex nitrogen compounds back into nitrogen gas (N2), completing the nitrogen cycle. This process returns nitrogen to the atmosphere in its elemental form. Fungi, viruses, and algae do not play this specific role in nitrogen cycling.

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