Some planktonic 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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Some planktonic cyanobacteria have the ability to fix nitrogen, converting it from a gas into a form that can be used by other organisms. This ability is similar to legumes on land that also have nitrogen-fixing bacteria in their roots. The nitrogen-fixing ability of cyanobacteria can have a fertilizing effect on the marine environment, promoting the growth of other organisms that require nitrogen as a nutrient.

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