worms only green plants only plants and animals only all the organisms in the ecosystem
I gave my students this multiple choice question: Which of these living things in a grassland ecosystem depend on the presence of a variety of bacteria and other microorganisms in the soil?

Only one answer is correct among these 4 choices:
- worms only
- green plants only
- plants and animals only
- all the organisms in the ecosystem

Could you tell me which one is correct?

all the organisms in the ecosystem