The characters of jellyfish include
(A) Typically have a radial symmetry
(B) Have head and mouth
(C) Triploblastic tissue organization
(D) Have specialized cells called nematocysts
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A defining feature of the Phylum Cnidaria (which includes jellyfish, anemones, and corals) is their diploblastic body plan.
They also possess unique stinging structures called nematocysts.