Medusa is the reproductive structure of

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(B) In the phylum $Cnidaria$,certain species exhibit a phenomenon known as metagenesis or alternation of generations.$Obelia$ is a classic example of

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Obelia

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(B) In the phylum $Cnidaria$,certain species exhibit a phenomenon known as metagenesis or alternation of generations.$Obelia$ is a classic example of this,where the organism exists in two body forms: the polyp and the medusa.The polyp is the sessile,asexual form,while the medusa is the free-swimming,sexual form.The medusa produces gametes,which fuse to form a zygote,eventually developing into a new polyp,thus acting as the reproductive structure.

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