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jellyfish tentacles ocean marine life underwater stinger transparent bioluminescence nematocyst cnidarian polyp medusa free-swimming predators prey filter feeders zooplankton microscopic planktonic jelly-like gelatinous soft-bodied radial symmetry bilateral symmetry asexual reproduction sexual reproduction regeneration immortal stinging cells neurotoxin venom dangerous beautiful mysterious fascinating evolution adaptation survival nature wildlife biology ecology conservation oceanography marine biology zoology