78% of earth's atmosphere is nitrogen gas. all living things need nitrogen as a part of dna and rna. yet you and i, and other living things, cannot use the nitrogen in our atmosphere directly. one type of organism is responsible for "fixing" nitrogen or to put it in a form so other living things can use it. that organism is

Hi!

The correct answer would be bacteria.

Nitrogen fixing, or nitrogen fixation, is the conversion of atmospheric nitrogen into compounds that can be readily utilized by other organisms. These compounds are ammonia and other nitrogenous compounds. Bacteria have the ability to convert the inert nitrogen in the atmosphere into  these nitrogen containing compounds, and are predominantly found in a symbiotic relationship with plants, or in the soil. These particular types of bacteria are known as nitrogen-fixing bacteria, such as Rhizobium.

Hope this helps!

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