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(A) The nitrogen cycle involves several microbial processes that return nitrogen to the atmosphere. $1$. Denitrification: This is the primary process

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Anaerobic ammonium oxidation,and denitrification

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(A) The nitrogen cycle involves several microbial processes that return nitrogen to the atmosphere. $1$. Denitrification: This is the primary process where bacteria such as $Pseudomonas$ and $Thiobacillus$ reduce nitrate $(NO_3^-)$ to dinitrogen gas $(N_2)$. $2$. Anaerobic Ammonium Oxidation (Anammox): This process involves the oxidation of ammonium $(NH_4^+)$ with nitrite $(NO_2^-)$ to produce dinitrogen gas $(N_2)$ under anaerobic conditions,primarily carried out by specialized bacteria like $Brocadia$ $anammoxidans$. Both processes are essential for completing the nitrogen cycle by returning fixed nitrogen to the atmosphere.

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas $(N_2)$ to the atmosphere?

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