Decomposition increases amount of organic matter in soil, and plant respiration and decomposition of dead plant life consume dissolved oxygen in the water. Given these facts, what increases the amount of organic matter in soil among the following options:
- chemical reaction
 - one celled organisms
 - aerobic capacity
 - nutrients
 - fossil fuels
 - Dissolved oxygen
 - chemical changes
 - swamp vegetation


 

      Dissolved oxygen   