Nutrients are released into the soil. Soil erosion decreases. Carbon dioxide is absorbed by the soil. Soil temperature decreases.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: How does an ecosystem benefit when leaves fall from a tree and decompose on the soil?
Possibilities:
- Nutrients are released into the soil.
- Soil erosion decreases.
- Carbon dioxide is absorbed by the soil.
- Soil temperature decreases.

Nutrients are released into the soil.