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The Nitrogen Cycle
Plants and animals need a source of nitrogen in order to make proteins, nucleic acids and other nitrogen-
containing compounds.

The atmosphere is made up of about 78% nitrogen.
There are very few organisms that can use nitrogen gas directly.
Most organisms need bacteria to convert it…

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Nitrogen Fixation
This is a process by which nitrogen gas is converted into nitrogen-containing compounds.
It can be carried out industrially and also naturally when light passes through the atmosphere.

The most important form of nitrogen fixation is carried out by microorganisms, of which there are two main types:



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