Question

the process by which waste and dead organisms decomposers release nitrogen back into the soil to be used again. denitrification decomposition sublimation fixation

Explanation:

Decomposition is the process where decomposers break down waste and dead organisms. This releases nitrogen back into the soil. Denitrification converts nitrates to nitrogen gas. Sublimation is a physical change (solid to gas). Fixation converts nitrogen gas to usable forms. Only decomposition matches the described process.

Answer:

Decomposition