Which of the following is not a step in the nitrogen cycle?

The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms in the environment. It includes several steps, such as nitrogen fixation, nitrification, denitrification, and ammonification.

Photosynthesis is not a step in the nitrogen cycle. Photosynthesis is the process by which plants use light energy to convert carbon dioxide and water into organic compounds, but it is not directly involved in the nitrogen cycle.

Nitrification, denitrification, and ammonification are all essential steps in the nitrogen cycle. Nitrification is the process by which ammonium is converted to nitrate by nitrifying bacteria. Denitrification is the process by which nitrate is converted to atmospheric nitrogen gas by denitrifying bacteria. Ammonification is the process by which organic nitrogen is converted to ammonium by decomposers.