The looseness of soil has a positive impact on a plant 's roots' growth in that soil.
Roots are the veins and arteries of the plant.
The looseness of soil has a positive impact on a plant 's veins and arteries growth in that soil.
The looseness of soil has a positive impact on what plant part and growth in that soil.

A: Roundworms
B: Top soil.
C: Earthworms
D: Veins and arteries.
E: agriculture
F: peachleaf willow
G: Plant silk leaves.
H: Leaves fallen on the ground