What is the role of decomposers in an ecosystem?

Decomposers play a vital role in ecosystems by recycling nutrients through the breakdown of dead organic matter, such as fallen leaves, dead animals, and waste products. This process not only helps in returning essential nutrients, like nitrogen and phosphorus, back to the soil but also promotes soil fertility. As decomposers, organisms like bacteria, fungi, and certain insects break down complex organic substances into simpler compounds, which can then be utilized by plants for growth. This decomposition process is crucial for maintaining the balance of ecosystems, as it ensures that nutrients are continuously cycled and made available for primary producers, thus supporting the entire food web.

The other options do not accurately reflect the primary function of decomposers. Decomposers do not produce organic matter; rather, they break down existing organic materials. They do not enhance photosynthesis directly in plants; rather, they contribute to nutrient availability that supports plant growth. Additionally, while decomposers do interact with bacteria, their main function is not to compete with them for resources but to work alongside them to decompose organic matter and recycle nutrients.