I would say commensalism since one organism benefits (the seeds) and the other other is neither benefited nor harmed
from the way it was created
Comets are most like planets have elliptical orbits
The pumping force of the ventricles moves blood through the arteries. The breathing movements exerts pressure on the chest veins, the valves in the larger veins keep the blood from flowing backwards, and the skeletal muscles' contraction all help the blood in veins to move.
