Obelia, a genus of hydrozoans, exhibits an intriguing life cycle with both polyp and medusa stages. This article presents an in-depth look at its classification, habitat, structure, and the fascinating alternation of generation. Despite the absence of true alternation of generations, Obelia's life h

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Polymorphism in cnidarians refers to the presence of diverse physiological and morphological forms within a single species. This phenomenon leads to the specialization and cooperation of zooids in colonial forms, eventually functioning collectively for the colony's benefit. The structural characteri

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