How is nitrogen returned to the atmosphere during the nitrogen cycle? a. it is returned to the atmosphere in a process called nitrogen fixation. b. it is returned to the atmosphere through denitrification. c. it is returned to the atmosphere through cellular respiration. d. it is returned to the atmosphere through evapotranspiration.

The best answer would be (b.) It is returned to the atmosphere through denitrification. The nitrogen is returned to the atmosphere during the nitrogen cycle through denitrification. Denitrification is a facilitated process to which is for the nitrogen reduction.

Nitrogen is returned to the atmosphere during the nitrogen cycle through denitrification.The nitrogen cycle is a cyclic process in which the atmospheric nitrogen is converted into a form that can be utilized by the living organism and then it is returned back to the atmosphere so that the cycle can continue.The process that is responsible for returning it back is denitrification in which the nitrate (NO3-) is converted back to nitrogen (N2) with the help of denitrifying bacteria who utilize nitrate to gain oxygen and in this process, the free nitrogen is liberated which returns back into the atmosphere.

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