What is it called when in an ecosystem some plants may convert atmospheric nitrogen into ammonia through a process

These organisms convert nitrogen in the soil to ammonia, which can then be taken up by plants. This process also occurs in aquatic ecosystems, where cyanobacteria participate. After nitrogen has been fixed, other bacteria convert it into nitrate, in a process known as nitrification.

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C. nitrogen fixation.

Explanation:

Nitrogen fixation is the process by which some plants, such as legumes, return atmospheric nitrogen gas to the soil as ammonia.

(From USATestprep)

the answer is:

carbon dioxide