The view that animals are polyphyletic is gaining wide acceptance among zoologists. Porifera 1 . Check the correct statements about the animals of the phylum Porifera. Tissues and organs are absent among poriferans. Choanocytes are flagellated cells.
Water enters the body of the sponge through the osculum.
The ascon is the simplest body form of the sponge. The body wall in the sycon is folded. Leucon sponges have the most complex canal system. Select the correct statements about the animals of the phylum Cnidaria . Animals with radial symmetry lack an anterior and posterior end.