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Nitrogen fixation is a key component of biogeochemical cycling. It also represents an important inter-species interaction, wh
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Answer #1

The logic followed by this answer is kind of clear when you analyze the biological relation: A bacteria gets to live with the protection of the plant root tissue, this bacteria fixes nitrogen and such nitrogen compounds created are taken by the plant too. The bacteria obtains a place to safely live and the plant obtains nutrition. Then the answer is:

D. Mutualism between plant and bacteria

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