Paco Cárdenas2 articles listing Paco Cárdenas in PNAS, Science Advances, indexed by Paperzzz from Crossref and OSF.Independent origins of spicules reconcile paleontological and molecular evidence of sponge evolutionary history Science AdvancesChemical characterization of C 31 sterols from sponges and Neoproterozoic fossil sterane counterparts PNAS