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| | Polyp - Definition, explanation |
 | | The body of the polyp may be roughly compared in structure to a sac, the wall of which is composed of two layers of cells. |
 | | We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth. |
 | | Anthozoan polyps, including the corals and sea anemones, are much more complex due to the development of a tubular stomodaeum leading inward from the mouth and a series of radial partitions called mesenteries. |
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