- Decomposition is when a decomposer recycles nutrients from dead organisms to the soil by eating those dead organisms
- Decomposition increases the amount of nutrients / nitrogen in the soil
- Therefore, decomposers can increase the amount of nutrients in the soil

- Decomposers can increase the amount of nutrients in the soil
- An earthworm is a kind of decomposer
- Topsoil is a kind of soil
- Therefore, earthworms can increase the amount of nutrients in the topsoil

Therefore, earthworms can increase the amount of nutrients in the topsoil
Earthworms move randomly throughout topsoil. How do earthworms most likely affect the topsoil?
- An earthworm is a kind of decomposer 
- Decomposition is when a decomposer recycles nutrients from dead organisms to the soil by eating those dead organisms 
- Decomposition increases the amount of nutrients / nitrogen in the soil 
- Topsoil is a kind of soil