which process occurs when bacteria converts nitrogen gas to a usable form?\ndecomposition\ncondensation\nfixa…

Brief Explanations:

Nitrogen - fixing bacteria convert nitrogen gas into ammonia or other nitrogen - containing compounds that plants can use. Decomposition is the breakdown of organic matter, condensation is a phase change of water vapor to liquid, and transpiration is water movement through a plant and evaporation from its leaves.

Answer:

C. fixation