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4)Azotobacter and archaea
5) Antibiotics medicine which is used for destroying bacteria and curing infections.
Explanation:
4)Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium
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