Fact 1: The looseness of soil increases the amount of oxygen in that soil.

Fact 2: Oxygen in the soil is vital for healthy roots.

Given the two facts above, answer the question "What is vital for healthy roots?" with the following options: 
- green leaves
 - nutrients
 - a healthy stem
 - hydration
 - looseness of soil
 - nearby mushrooms
 - aqueous solution
 - Organic compounds


 

     looseness of soil    