Which of the following describes the helpful role that bacteria play in nitrogen fixation?

"A.        Bacteria convert atmospheric carbon dioxide into a form of trapped carbon that animals can use. B.        Bacteria convert yogurt into cheese, which can be eaten as food by humans or animals.        C.        Bacteria convert a healthy animal into a sick animal by producing a toxin or growing into a large population.D.        Bacteria convert atmospheric nitrogen into a nitrogen-containing ion that plants can absorb."

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ringostarr 30-01-2013
ringostarr - Manchester Metropolitan University
D. Bacteria convert atmospheric nitrogen into a nitrogen-containing ion that plants can absorb.
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sathasivam 17-05-2013
sathasivam - Indian Institute of Management (IIM)
"Microorganisms turn atmospherical nitrogen in a nitrogen-containing ion of which crops can certainly engross. "
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