They're the only vein that carries oygenated blood
<span>This result is produced by the selective permeability of the plasma membrane when the presence of negatively charged ions does not diffuse into the cell and the action of several sodium-potassium pump units causes an unequal distribution of charges through the membrane.</span>
I would say b cows cause if there at the top of the Food chain that would be the next thjng down I think
