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Azotobacter and Bacillus polymyxa are examples of

1. symbiotic nitrogen-fixers
2. non-symbiotic nitrogen-fixers
3. ammonifying bacteria
4. disease-causing bacteria

Correct answer: non-symbiotic nitrogen-fixers

Solution

Azotobacter and Bacillus polymyxa can fix atmospheric nitrogen independently, so they are free-living, non-symbiotic nitrogen-fixers. They do not require a plant host like symbiotic bacteria do.

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