The primary role of decomposers in nutrient cycling is to break down organic matter from dead plants and animals, recycling essential nutrients back into the ecosystem. Decomposers, including bacteria, fungi, and detritivores, play a crucial part in energy flow by decomposing complex organic materials into simpler substances. This process enriches the soil, making nutrients available for producers, thus sustaining the food web. By facilitating decomposition, these organisms ensure ecosystem health and functioning, ultimately contributing to the resilience and productivity of the environment.