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  1. Cnidarian | Definition, Life Cycle, Classes, & Facts | Britannica

  2. Characteristics, Habitat, Diet, Anatomy, & Facts - Britannica

  3. Medusa | Sea creature, Marine life, Tentacles | Britannica

  4. Cnidarian - Polyp, Medusa, Tentacles | Britannica

  5. Hydra | Freshwater, Cnidaria, Polyp | Britannica

  6. Anatomy of cnidarians | Britannica

  7. Cnidarian - Radial Symmetry, Polyp & Medusa | Britannica

  8. Polyp | Cnidarian, Coral & Sea Anemone | Britannica

  9. Sea pen | Cnidarian, Anthozoan & Polyp | Britannica

  10. Cnidarians Portal | Britannica