You are presented with the question "Why does it help for dirt to be loose?" and the following answer choices: 
- Physical weathering
 - adding heat
 - It used to be covered by water
 - permineralization
 - water conservation
 - Roots get more oxygen
 - The area was once underwater
 - Riding a bike

Now knowing that the looseness of soil increases the amount of oxygen in that soil and soil oxygen effects on root development, choose the best answer.


 

      Roots get more oxygen   