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B
Cnidaria
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C
Platyhelminthes
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D
Arthropoda
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Solution
The correct option is B Cnidaria
Polymorphism is the occurrence of multiple morphological forms.
It is common in members of the phylum Coelenterata.
The members of Cnidaria have life cycles that alternate between two forms: asexual polyps (generally sessile, with the body as a vase-shaped form), which are nutritive in function; and sexual, free-swimming forms called medusae (singular medusa, the body in a bell-shaped form), which are reproductive in function.