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pants: ELECTROLYTES FOR TRILOBITES pants: I, THE SECOND GAYEST EXTINCT MARINE ARTHROPOD THAT OCCURRED ABUNDANTLY DURING THE PALEOZOIC ERA, WITH A CARAPACE OVER THE FOREPART, AND A SEGMENTED HIND PART DIVIDED LONGITUDINALLY INTO THREE LOBES pants: WHAT PART OF SEGMENTED HIND DON'T YOU UNDERSTAND