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Unformatted text preview: and proteins. However, the nitrogen in the atmosphere is not in a form that plants can utilize. Many plants have a symbiotic relationship with bacteria growing in their roots: organic nitrogen as rent for space to live. These plants tend to have root nodules in which the nitrogen-fixing bacteria live. All the nitrogen in living systems was at one time processed by these bacteria, who took atmospheric nitrogen (N 2 ) and modified it to a form that living things could utilize (such as NO 3 or NO 4 ; or even as ammonia, NH 3 in the example shown below)....
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