The major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate are:

Name: The major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate are:
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Bacteria are the major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate. This process is called nitrification, and it plays a crucial role in the nitrogen cycle. Algae and protozoa can fix nitrogen, but they do not oxidize it to nitrate. Fungi do not fix or oxidize nitrogen.

The Major Group of Organisms That Fix Nitrogen into Ammonia