why living things need nitrogen?

Question

why living things need nitrogen?

Answer 1

Nitrogen is an essential part of amino acids and nucleic acids both of which are essential to all life. Some plants are able to assimilate nitrogen directly in the form of nitrates which may be present in soil from natural mineral deposits, artificial fertilizers, animal waste, or organic decay (as the product of bacteria, but not bacteria specifically associated with the plant). Nitrates absorbed in this fashion are converted to nitrites by the enzyme nitrate reductase, and then converted to ammonia by another enzyme called nitrite reductase.Nitrogen compounds are basic building blocks in animal biology. Animals use nitrogen-containing amino acids from plant sources, as starting materials for all nitrogen-compound animal biochemistry, including the manufacture of proteins and nucleic acids.

Answer 2

Plants use the nitrogen to make important molecules.
Herbivores use the nitrogen in plants to make nitrogen containing proteins.We eat other animals and turn it into human proteins. Urine and animal waste contains excess nitrogen.

Answer 3

It is an essential element in amino acids which are essential to all of life.