If ctenophores are sister to all animal taxa, excluding cnidarians and placazoans, then: (Select all that apply.)a) ancestral sponges exhibited morphologic complexity seen in other Eumetazoans. b) the anatomical complexity of ctenophores arose independently of what is found in other Eumetazoan groups. c) the nervous system of ctenophores evolved independently of other animals. d) radial symmetry was lost in placazoans. e) None of the answer options is correct.