A water wave should be the answer.. if not then electromagnetic is the closest thing to being correct..
It is when the inclination of atoms of a dissolvable to go through a semipermeable layer from a less amassed arrangement into a more focused one, evening out the fixations on each side of the film.
I hope the answer will help you.
<em>the following diagram explains it clearly:
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Your kidneys will filter the blood so as to remove excess water, urea, cell waste, with the additional removal of salts! Hope this helps!
