Some planktoic cyanobacteria have the ability to "fix" which of the following elements thus having a fertilizing effect on the marine environment similar to the ability of the land plants legumes?

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Planktonic cyanobacteria have the ability to "fix" atmospheric nitrogen (N2) into a biologically available form, such as ammonia (NH3), nitrite (NO2-), or nitrate (NO3-), through a process called nitrogen fixation. This provides a source of nitrogen for other marine organisms, similar to how legumes provide nitrogen for other plants in terrestrial ecosystems.

Some Planktoic Cyanobacteria Have the Ability to "Fix" Which of the Following