- A mushroom is a kind of fungus
- In the food chain process fungi have the role of decomposer
- So, in the food chain process a mushroom has the role of decomposer

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

- In the food chain process a mushroom has the role of decomposer
- The role of a decomposer is to break down dead organisms
- Therefore, the role of a mushroom is to break down dead organisms

- The role of a mushroom is to break down dead organisms
- A plant is a kind of organism
- Therefore, the role of a mushroom is to break down dead plants

Therefore, the role of a mushroom is to break down dead plants
[Question]Which of the following best describes a role of mushrooms in ecosystems?
[Context]- Decomposer is a kind of role in the food chain process / in an ecosystem 
- A mushroom is a kind of fungus 
- In the food chain process fungi have the role of decomposer 
- A plant is a kind of organism 
- Decomposition is when a decomposer breaks down dead organisms