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Download The atmosphere is 78% N2. All organisms need nitrogen to make
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The atmosphere is 78% N2. All organisms need nitrogen to make DNA and proteins. Most organisms cannot use the N2 in the atmosphere. A certain type of bacteria can “fix” nitrogen- which means to break apart an N2 molecule and convert it into nitrogen compounds that can be used by plants and other living things. These nitrogen fixing bacteria can live in the soil or on the roots of certain plants (in a symbiotic relationship.) Nitrogen is passed along the food chain and recycled by decomposers.