- When something decays that something undergoes decomposition
- Dead organisms decay
- Hence, when dead organisms decay they undergo decomposition

- When dead organisms decay they undergo decomposition
- Decomposition is when a decomposer breaks down dead organisms
- So, a decomposer causes dead organisms to decay

- A decomposer causes dead organisms to decay
- A microorganism is a kind of decomposer
- Hence, microorganisms cause dead organisms to decay

- Microorganisms cause dead organisms to decay
- If something cause something else to happen then that something is responsible for that something else
- So, microorganisms are resposible for the decay of dead organisms

So, microorganisms are resposible for the decay of dead organisms
Question
Which of the following is most responsible for the decay of dead organisms?

Context
- Decomposition is when a decomposer breaks down dead organisms 
- When something decays that something undergoes decomposition 
- Dead organisms decay 
- If something cause something else to happen then that something is responsible for that something else 
- A microorganism is a kind of decomposer