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Hollow sac animalsa. helminthsb. annelidac. coelenteratad. nematoda |
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Answer» c Cnidaria/Coelenterata (HOLLOW sac-like ANIMALS)Radially symmetrical, diploblastic multicellular animals with a tissue GRADE of organisation. Aquatic, freshwater or marine solitary or colonial forms which may be free swimming or SEDENTARY. |
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