- Soil is usually part of an environment
- Soil is a kind of nonliving thing
- Therefore, soil is a nonliving part of an environment

- Soil is a nonliving part of an environment
- A forest is a kind of environment
- Therefore, soil is a nonliving part of a forest

So, soil is a nonliving part of a forest
[Question]Which of these is a nonliving part of a forest?
[Context]- A forest is a kind of environment 
- Soil is usually part of an environment 
- Soil is a kind of nonliving thing