You are presented with the question "what are able to increase the amount of nutrients in the soil" and the following answer choices: 
- Frogs
 - farms
 - mussels
 - bacteria
 - clams
 - plants
 - acid rains
 - tractors

Now knowing that decomposition increases the amount of nutrients in the soil and moisture is needed for bacterial decomposition, choose the best answer.


 

    bacteria     