There was always a river, eating away at the mountain as it had for eons, carrying with it minute particles, piece by piece in its frantic torrents.
The laws which govern particles of matter in the inorganic world govern them likewise if they are joined into an organism.
If we examine such a substance as sugar we find that it can be broken up into fine grains, and these again into finer, the finest particles still appearing to be of the same nature as sugar.
The same is true in the case of a liquid such as water; it can be divided into drops and these again into smaller drops, or into the finest spray the particles of which are too small to be detected by our unaided vision.
Moreover, small particles do not seem to exist in the water until it is broken up; so far as we can see, the material of the water is continuous not granular.
How would you define particles? Add your definition here.