Ancient gelatinous animals that resemble Christmas tree ornaments were protected by hard, spiny skeletons and lacked the trademark tentacles of today's jellies, fossils of the long-dead jellyfishlike creatures suggest.
Ancient gelatinous animals that resemble Christmas tree ornaments were protected by hard, spiny skeletons and lacked the trademark tentacles of today's jellies, fossils of the long-dead jellyfishlike creatures suggest.
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