a decrease in temperature a decrease in biodiversity an increase in the number of predators an increase in the number of decomposers
I gave my students this multiple choice question: Leaves fall from deciduous trees onto the forest floor. These leaves decay slowly and become part of the topsoil. Which change is most likely to have a positive impact on the nutrients available in the topsoil?

Only one answer is correct among these 4 choices:
- a decrease in temperature
- a decrease in biodiversity
- an increase in the number of predators
- an increase in the number of decomposers

Could you tell me which one is correct?

an increase in the number of decomposers