One of the most poisonous marine organisms is a cnidarian known as the sea wasp or box jellyfish; the motile adult organism is best described as a(n)

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The sea wasp or box jellyfish is a medusae, which is the mobile or free-swimming form of cnidarians. The polyp form is usually sessile or attached to a surface. Cnidoblasts are the stinging cells of cnidarians, and anthozoans are a class of cnidarians that only exist as polyps.

One of the Most Poisonous Marine Organisms Is a Cnidarian