- A green plant is a kind of organism
- A leaf is a part of a green plant
- If leaves fall out from a green plant, then those leaves are dead
- So, fallen leaves are dead organism parts

- If something contains a substance then the parts of that something contain that substance
- Dead organisms contains nutrients for decomposers
- Hence, dead organism parts contain nutrients for decomposers

- Dead organism parts contain nutrients for decomposers
- Decomposition is when a decomposer returns nutrients from dead organisms to the soil by eating those dead organisms
- Hence, decomposition can be when a decomposer returns nutrients from dead organism parts to the soil by eating those dead organism parts

- Fallen leaves are dead organism parts
- Decomposition can be when a decomposer returns nutrients from dead organism parts to the soil by eating those dead organism parts
- Hence, fallen leaves can be break down and become nutrients through decomposition

Hence, fallen leaves can be break down and become nutrients through decomposition
Question
Plants use nutrients found in soil. Which of these can break down in soil and become nutrients?

Context
- Decomposition is when a decomposer returns nutrients from dead organisms to the soil by eating those dead organisms 
- A green plant is a kind of organism 
- If something contains a substance then the parts of that something contain that substance 
- Dead organisms contains nutrients for decomposers 
- A leaf is a part of a green plant 
- If leaves fall out from a green plant, then those leaves are dead