The phylum cnidaria was earlier included under the phylum ______ ( fill in the blanks )
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Phylum Cnidaria includes animals that exhibit radial or biradial symmetry and are diploblastic, ... These cells are located around the mouth and on the tentacles, and serve to capture prey or repel predators. ... with which it regulates buoyancy by filling and expelling carbon monoxide gas. ... Previous: Phylum Porifera.
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