What role do nitrogen fixing bacteria perform in the nitrogen cycle

Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). ... More than 90 percent of all nitrogen fixation is affected by these organisms, which thus play an important role in the nitrogen cycle.

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vascular tissue transports materials from the environment into the plant.

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.