The looseness of soil increases the amount of oxygen in that soil, and without oxygen in the soil, most plants die. Given these facts, plants may die without what among the following options:
- nucleus of a cell
 - some looseness in the soil
 - wavelengths and photons
 - moss
 - single-celled organisms
 - organic molecules
 - snow
 - rocks


 

  some looseness in the soil       