Steps of the Nitrogen Cycle
Atmospheric nitrogen (N2) is converted to __________ by nitrogen-fixing bacteria in aquatic and soil environments. These organisms use nitrogen to synthesize the biological molecules they need to survive.
_________ is subsequently converted to nitrite and nitrate by bacteria known as nitrifying bacteria.
Plants obtain nitrogen from the soil by absorbing ____________ and nitrate through their roots. These substances are used to produce organic compounds.
Nitrogen in its organic form is obtained by animals when they ________ plants or animals.
Decomposers return _____________to the soil by decomposing solid waste and dead or decaying matter.
Nitrifying bacteria convert ___________ to _________ and _________.
Denitrifying bacteria convert __________ and ________ to ________, releasing it back into the atmosphere.
