Write the given statement in your answer books after filling in the blanks? 3 a) Pila and Unio have an external shell and belong to the phylum_____. b) Free living marine animals with water driven tube system are in the phylum ______. c) To which phylum do sponges belong_____.
(a) Pila and Unio have an external shell and belong to the phylum Mollusca. (b) Free living marine animals with water driven tube system are in the phylum Echinodermata. (c) Sponges belong to phylum Porifera.
