You are presented with the question "What in soil is vital for healthy roots?" and the following answer choices: 
- looseness
 - nutrients
 - leftovers
 - compacted
 - ferns
 - cells
 - energy
 - trash

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        