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The Nitrogen Cycle Picture Source: Sandner, L (2009). Investigating Science 9. Pearson. 1. 2. 3. 4. 5. 6. 7. _______________________________: This cycle shows how nitrogen atoms are reused/recycled through biotic and abiotic parts in the environment. _______________________ causes nitrogen gas (N2) to react with oxygen in the air to produce ________________________ (NH3). _________________________ changes the ammonia into __________________ and then into ______________________ (NO3) - this process is known as _____________________________________________________. Some bacteria (____________________________________) in the soil and also in nodules on the roots of certain plants, can also change nitrogen in the air into ammonia and then nitrifying bacteria changes the ammonia into nitrites and then into nitrates (NO3) - which can be used by ________________________ Nitrates _____________________________ in rainwater, enter the soil and are ______________________ by plant roots. Plant cells use nitrates to make _________ (genetic material) and to make _______________. Plants are _______________________ by animals. Animals break down plant proteins into ________________________ and then use amino acids to make animal ________________________. a)b) When plants or animals die, ______________________________ (including bacteria) break down nitrogen containing chemicals into simpler chemicals like ___________________ (NH3). c) Feces and urine of animals also have nitrogen containing chemicals that decomposers break down into ammonia. Some bacteria can change nitrites into nitrates which can then be used by plants again (step 3) or step 7 occurs. Some bacteria (________________________________) can change nitrates into nitrites and then into nitrogen gas (N2) and in this way return nitrogen to the _________________________________. The process occurring in step 7 is known as __________________________________. These steps are continuously repeated. In this way nitrogen atoms are continuously reused/recycled in an ecosystem.