You are presented with the question "What increases the amount of organic matter in soil?" and the following answer choices: 
- chemical reaction
 - one celled organisms
 - aerobic capacity
 - nutrients
 - fossil fuels
 - Dissolved oxygen
 - chemical changes
 - swamp vegetation

Now knowing that decomposition increases amount of organic matter in soil and plant respiration and decomposition of dead plant life consume dissolved oxygen in the water, choose the best answer.


 

      Dissolved oxygen   