- Decomposition is when a decomposer breaks down dead organisms
- Decomposer is a kind of role in the food chain process / in an ecosystem
- So, the role of decomposers in the food chain process is to break down dead organisms

- The role of decomposers in the food chain process is to break down dead organisms
- An organism is a source of organic matter
- Hence, the role of decomposers in the food chain process is to break down dead organic matter

Hence, the role of decomposers in the food chain process is to break down dead organic matter
Q: What is the role of decomposers in a food chain?
Context:
- Decomposition is when a decomposer breaks down dead organisms 
- An organism is a source of organic matter 
- Decomposer is a kind of role in the food chain process / in an ecosystem