In an ecosystem, what is the primary role of decomposers like bacteria and fungi?

The correct answer to the question "In an ecosystem, what is the primary role of decomposers like bacteria and fungi?" is Option C: To break down dead organic matter and return nutrients to the soil..

The other options — A) To produce their own food through photosynthesis., B) To consume other living organisms for energy., D) To serve as primary consumers in the food chain. — are incorrect for this GED Exam Prep question. As explained above: Decomposers break down dead plants and animals, returning essential nutrients (like nitrogen and phosphorus) to the soil, making them available for producers.