Describe nitrogen cycle

Nitrogen Cycle : Nitrogen is one of the most essential constituent of living beings. This is because nitrogen is part of chlorophyll, nucleic acids and vitamins. Plants and animals cannot directly consume the nitrogen present in the atmosphere. This work is done by the algae and bacteria .  They fix the atmospheric nitrogen and converts it into nitrite and nitrate. The roots of the plants consume these nitrites and nitrates from the soil. The nitrogen is used to synthesis amino acid, proteins, etc. in the plants. This in turn is consumed by animals feeding on these plants. The dead bodies of these animals are worked upon by the bacteria and fungi present in soil and lead to their decomposition. They convert the compounds of nitrogen back into nitrates and nitrites. These are further converted into nitrogen gas and released in atmosphere by certain specialized bacteria thus balancing the percentage of nitrogen in atmosphere.