You are presented with the question "What is vital for healthy roots?" and the following answer choices: 
- green leaves
 - nutrients
 - a healthy stem
 - hydration
 - looseness of soil
 - nearby mushrooms
 - aqueous solution
 - Organic compounds

Now knowing that the looseness of soil increases the amount of oxygen in that soil and oxygen in the soil is vital for healthy roots, choose the best answer.


 

     looseness of soil    