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 "Healthy roots can be due to what aspect of soil?" with the following options: 
- less water
 - dryness
 - growth
 - climate
 - looseness
 - nutrients
 - roughness
 - compact


 

     looseness    