(B) Nitrogen $(N)$ is a critical element for all living organisms. It is a major constituent of proteins,nucleic acids ($DNA$ and $RNA$),amino acids,v

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(B) Nitrogen $(N)$ is a critical element for all living organisms. It is a major constituent of proteins,nucleic acids ($DNA$ and $RNA$),amino acids,vitamins,hormones,chlorophyll,and many coenzymes. It is required by plants in the greatest amount and is absorbed mainly as $NO_3^-$ or $NH_4^+$.