Metagenesis can be seen in

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(C) Metagenesis (alternation of generation) is a phenomenon observed in certain cnidarians where the organism exists in two distinct body forms: the s

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Physalia

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(C) Metagenesis (alternation of generation) is a phenomenon observed in certain cnidarians where the organism exists in two distinct body forms: the sessile,cylindrical $polyp$ form and the free-swimming,umbrella-shaped $medusa$ form.In this process,polyps produce medusae asexually,and medusae produce polyps sexually.Among the given options,$Physalia$ (Portuguese man-of-war) is a member of the class $Hydrozoa$ that exhibits this phenomenon.$Hydra$ exists only in the polyp form,while $Adamsia$ and $Meandrina$ exist primarily in the polyp form.

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