name two biological nitrogen fixers and their place of living( habitat)
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There are two main types of nitrogen-fixing bacteria. Symbiotic, or mutualistic, species live in root nodules of certain plants. Other nitrogen-fixing bacteria are free-living and do not require a host. They are commonly found in soil or in aquatic environments.
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Many heterotrophic bacteria live in the soil and fix significant levels of nitrogen without the direct interaction with other organisms. Examples of this type of nitrogen-fixing bacteria include species of Azotobacter, Bacillus, Clostridium, and Klebsiella.
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