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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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