Water then leaves through the osculum, a large hole at the top of the sponge. Choanocytes are specialized cells that use flagella to move a steady current of water through the sponge.
The body of a sponge forms a wall around a large central cavity through which water is circulated continually. body structure - A sponge can be thought of as a large, cylindrical water pump (outside poors, inside hollow cavity). body symmetry - Sponges are asymmetrical they have no front or back ends, and no left or right sides. movement - Sponges are sessile, meaning that they live their entire adult life attached to a single spot.
Sponges are classified as animals because they are multicellular, heterotrophic, have no cell walls, and contain a few specialized cells.
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