Answer:
The correct answer is E) Nitrobacter, Rhizobium, and Azospirillum. Because all three bacterial genera play important roles in environmental nitrogen cycles.
Step-by-step explanation:
Nitrobacter is a genus of bacteria that plays a crucial role in the nitrogen cycle by converting nitrite (NO2-) to nitrate (NO3-), which is an important nutrient for plant growth.
Rhizobium is a genus of bacteria that is commonly found in the root nodules of leguminous plants. These bacteria are capable of fixing atmospheric nitrogen into a form that can be used by plants.
Azospirillum is a genus of bacteria that is commonly found in the rhizosphere (soil surrounding plant roots). These bacteria are capable of fixing atmospheric nitrogen and are known to increase plant growth and yield.
Therefore, all three bacterial genera (Nitrobacter, Rhizobium, and Azospirillum) are important players in the environmental nitrogen cycle.
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