Asked by Kaled

Nitrogen fixation is carried out primarily by humans by...
A. Humans.
B. Plants.
C. Bacteria.
D. Consumers.
Answered by PsyDAG
Since this is not my area of expertise, I searched Google under the key words "<I>Nitrogen fixation</I>" to get these possible sources:

http://en.wikipedia.org/wiki/Nitrogen_fixation
(Broken Link Removed)

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
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