Bacteria is required to complete the nitrogen cycle including the process of denitrification ( A )
The nitrogen cycle is the process whereby nitrogen moves from the atmosphere into the soil and from the soil back to the atmosphere. during the nitrogen cycle, nitrogen fixation takes places ( conversion of nitrogen gas into inorganic nitrogen compounds ).
Certain bacteria ( Azotobacterial and archaea ) are the organisms responsible for nitrogen fixation and the process of denitrification.
Hence the organisms required to complete the nitrogen cycle including the process of denitrification is Bacteria
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