Answer:
The decomposer has recycled the organic materials in the leaf and released them back into the soil.
Step-by-step explanation:
Decomposers are the heterotrophic microbes that derive their nutrition by digesting the dead organic matter present in the dead bodies of living beings such as fallen leaves. As a leaf falls from a plant on the land, decomposers present in the soil start its digestion.
The organic and inorganic nutrients present in the leaves are digested into the simpler substances which in turn are released back into the soil. Therefore, decomposers serve in nutrient cycling by releasing substances such as carbon, nitrogen, phosphorus, and sulfur from the dead bodies of living beings back into nature to allow their reuse.