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Summary
the jellyfish or sea jelly species refers to the medusa-stage of members of the subphylum Medusozoa with the overarching phylum of Cndaria. they are a type of gelatinous marine invertebrate with radial symmetry and venomous tentacles.
the creature is composed of three different layers: the epidermis (outer layer), the mesoglea (a jelly-like inside), and the gastrodermis (inner layer). however, even with their elementary nervous system, jellyfish lack a centralized brain as well as nociceptors like what complex animals use to respond to stimuli.
the jellyfish can be found in every ocean on earth.