Pick and copy all the incorrect options for the following question:

Forest fires occur in many areas due to drought conditions. If the drought conditions continue for a long period of time, which might cause the repopulation of trees to be threatened?

Options:
- a decrease in the thickness of soil
- a decrease in the amount of erosion
- an increase in the bacterium population
- an increase in the production of oxygen





- a decrease in the amount of erosion



- an increase in the bacterium population



- an increase in the production of oxygen

