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Unformatted text preview: trogen Cycle: Example of an atmosphere- derived nutrient Biosphere pool Soil pool Atmospheric pool Nitrogen- fixing bacteria live in root nodules in the roots of some types of plants, such as beans h0p://commons.wikimedia.org/wiki/File:Medicago_truncatula_A20_root_nodules.JPG Legumes such as beans are rich in protein, in part because they have abundant access to organic nitrogen through their mutualis?c rela?onship with nitrifying bacteria in their root nodules h0p://...
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