Hydrozoa is a class within the phylum Cnidaria that includes small, often colonial organisms like hydras and the Portuguese man o' war. These creatures exhibit both polyp and medusa life stages, showcasing a complex life cycle that allows them to thrive in various marine environments. Hydrozoans are known for their ability to reproduce asexually through budding and sexually through gamete production, highlighting their adaptability and diversity within aquatic ecosystems.
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