Most members of the ____ Cnidarian lineage, including Obelia species, have both polyp and medusa stages in their life cycles, with the polyp stage typically forming a colony.

Question

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Hydrozoa is the correct answer because this class of the phylum Cnidaria typically exhibits a life cycle that includes both polyp and medusa stages, with the polyp stage often forming colonies, as seen in Obelia species.

Most Members of the ____ Cnidarian Lineage, Including Obelia Species