What is nitrogen?? explain!!
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for harshu!!​

Nitrogen is also found in the nucleus of every living cell as one of the chemical components of DNA. ... In nature, most nitrogen is harvested from the atmosphere by microorganisms to form ammonia, nitrites, and nitrates that can be used by plants.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.