cause disease in living organisms. reduce soil erosion. recycle oxygen to the air. return nutrients to the soil.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Decaying plants and animals are important to an ecosystem because they
Possibilities:
- cause disease in living organisms.
- reduce soil erosion.
- recycle oxygen to the air.
- return nutrients to the soil.

return nutrients to the soil.