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.

Nitrogen is returned to the atmosphere during the nitrogen cycle through denitrification.

Therefore, nitrogen is returned to the atmosphere during the nitrogen cycle through denitrification.

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humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.