faylin

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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