If the looseness of soil has a positive impact on a plant 's veins and arteries growth in that soil, then the looseness of soil has a positive impact on what plant part and growth in that soil.?

Answer choices:
- Roundworms
 - Top soil.
 - Earthworms
 - Veins and arteries.
 - agriculture
 - peachleaf willow
 - Plant silk leaves.
 - Leaves fallen on the ground

 

    Veins and arteries.      