Examine the figure below.Which of the following add ammonium to the soil by decomposing organic matter?

Question

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Ammonifying bacteria decompose organic matter and release ammonium ions (NH4+) into the soil. Nitrifying bacteria convert ammonium ions (NH4+) to nitrite (NO2-) and then to nitrate (NO3-). Nitrogen-fixing bacteria convert atmospheric nitrogen into a usable form for plants, while denitrifying bacteria convert nitrate (NO3-) back into atmospheric nitrogen.

Examine the Figure Below