- Decomposition is when a decomposer breaks down dead organisms
- A decomposer is a kind of organism
- Therefore, a decomposer is a kind of organism that breaks down dead organisms

- A plant is a kind of organism
- An animal is a kind of organism
- So, plants and animals are kinds of organisms

- A decomposer is a kind of organism that breaks down dead organisms
- Plants and animals are kinds of organisms
- Therefore, a decomposer is a kind of organism that breaks down dead plants and animals

Therefore, a decomposer is a kind of organism that breaks down dead plants and animals
Q: A decomposer is an organism that
Context:
- Decomposition is when a decomposer breaks down dead organisms 
- A decomposer is a kind of organism 
- A plant is a kind of organism 
- An animal is a kind of organism