An example of a decomposer in nature is the fungus species. Decomposers break down dead organic matter, returning vital nutrients to the soil, which promotes the health of ecosystems. Other examples include bacteria, earthworms, and insects. These organisms play a crucial role in the nutrient cycling process, ensuring the decomposition of dead plants and animals leads to the replenishment of soil fertility. This recycling of nutrients is vital for agricultural practices and the overall balance within ecosystems.