You are presented with the question "Plants may die without what?" and the following answer choices: 
- nucleus of a cell
 - some looseness in the soil
 - wavelengths and photons
 - moss
 - single-celled organisms
 - organic molecules
 - snow
 - rocks

Now knowing that the looseness of soil increases the amount of oxygen in that soil and without oxygen in the soil, most plants die, choose the best answer.


 

  some looseness in the soil       