What organisms play the largest role in moving nitrogen between the atmosphere and plants?

bacteria

Explanation:

Nitrogen moves in the ecosystem through various biotic and abiotic parts. The roots of the plants helps in transforming the nitrogen gas into nitrates so that it can be absorbed by the plants. This process is termed to be nitrogen fixation. The bacteria living in the soil helps in the process. These bacteria are present in the roots of the plants. This helps in the growing up of the plants.

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well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.