Decomposers play a critical role in the nutrient cycle by breaking down organic matter from dead plants and animals. This process converts complex organic substances into simpler compounds, which can then be reabsorbed by primary producers like plants. Decomposers, including fungi, bacteria, and other microorganisms, facilitate the recycling of nutrients such as nitrogen, phosphorus, and carbon back into the soil, enriching it for future growth. By decomposing organic material, they maintain ecosystem health, support plant growth, and contribute to the overall biodiversity within habitats.