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23.4 Flatworms, Mollusks, and Annelids
Flatworms, mollusks, and annelids belong to closely related phyla.
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| complete digestive tract | digestive system that has two openings, a mouth and an anus, that are at opposite ends of a continuous tube |
| radula | file-like feeding organ found in mollusks |
| hemocoel | open space between cells in animal tissues |
| segmentation | repeated sections of an animal's body that contain the same set of body structures, apart from its distinct head and tail region |
| coelom | fluid-filled space that is completely covered by mesoderm |
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BVNW |
Blue Valley Northwest High School |
| Overland Park, KS |
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