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POPSJellyfish - Evolution Mystery More: "we can no longer accept that cnidarians are an evolutionary relic. They are in fact highly evolved to take advantage of their habitat and the 'higher' animals within it, as their ability to kill all kinds of vertebrates (including humans) demonstrates. Soft-bodied animals don't leave fossils easily, and their exact phylogeny is always controversial. The terrifying truth about jellyfish is that they mess up our established ideas about evolution, and show us how much we have left to learn."