The looseness of soil has a positive impact on a plant 's roots' growth in that soil, and baby plants grow faster if separated with a large amount of roots. Given these facts, what has a positive impact on baby plants among the following options:
- lack of water
 - lack of sunlight
 - organic molecules
 - crowded root space
 - the looseness of soil
 - genetic diversity
 - animals with backbones
 - Reproduction


 

     the looseness of soil    