Nitrogen Cycle (1)

Nitrogen is crucial for all organisms because it is an essential part of proteins and nucleic acids. About 78% of the atmosphere nitrogen gas (N2), the largest gaseous reservoir of any element. In its gas form, N2 is useless to most organisms. However, certain nitrogenfixing bacteria and algae found in soil and wet habitats can convert inorganic nitrogen into forms, especially nitrates, which are immediately useable by plants