It adds nutrients to the soil. It helps the soil to dry out. It keeps the soil cool. It destroys bacteria in the soil.
I gave my students this multiple choice question: How does the presence of organic matter contribute to good soil?

Only one answer is correct among these 4 choices:
- It adds nutrients to the soil.
- It helps the soil to dry out.
- It keeps the soil cool.
- It destroys bacteria in the soil.

Could you tell me which one is correct?

It adds nutrients to the soil.