You are presented with the question "Deep burrowing earthworms do what to the looseness of soil for root growth?" and the following answer choices: 
- compact
 - improve
 - nutrients
 - destroy
 - erosion
 - support
 - decrease
 - Movement

Now knowing that the looseness of soil has a positive impact on a plant 's roots' growth in that soil and deep burrowing earthworms improve soil porosity, water movement and plant root growth, choose the best answer.


 

  improve       