Pikaia gracilens is an extinct invertebrate animal described from the wonderful pre-cambrian soft-bodied fossils of the burgess shale in british columbia. examinations by paleontologists have revealed that organisms belonging to this species had a prominent notochord and segmental muscles. from this information, you could conclude that it is closely related to
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Pikaia gracilens is an extinct invertebrate animal described from the wonderful pre-cambrian soft-bo...
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