Water changes bacteria in the soil converts this nutrient into a usable form. plants take up the usable nutrient through the soil and assimilate it into proteins, making it part of the plant. an animal eats the plants, and the nutrient becomes part of the animal. when the animal dies, it decomposes, returning the nutrient back to the soil. which cycle is being described? water cycle carbon cycle nitrogen cycle phosphorous cycle

The correct answer is the nitrogen cycle.  

Nitrogen cycle refers to an array of procedures by which nitrogen and its compounds are interchanged in the living organisms and in the environment, comprising decomposition and nitrogen fixation. There is a need for the plants to convert nitrogen into the usable form to be utilized by the living species. The cycling of the nitrogen takes place via four procedures, that is, decomposition, nitrogen fixation, denitrification, and nitrification.  

The correct answer is the nitrogen cycle.  

Nitrogen cycle refers to an array of procedures by which nitrogen and its compounds are interchanged in the living organisms and in the environment, comprising decomposition and nitrogen fixation.