Practice problem
Nitrogen Cycle — Definition & Diagrams

Image by: Pollinator CC-BY-SA-3.0, via Wikimedia Commons.
Those are peanuts, but they're actually legumes!
Certain legumes are a host to bacteria called rhizobia. The two live in a symbiotic relationship, where the plant provides nutrients and energy for the bacteria. Which of the following processes does the bacteria most likely carry out?