Botany - Animal Kingdom Question with Solution | TestHub

The animal nature of sponges was well established on the following grounds: (i) Sponges feed on inwafted solid particles. Their mode of nutrition is truly holozoic.
(ii) Sponge cells are devoid of cellulose cell walls.
(iii) The life cycle of sponges includes swimming ciliated larval stages resembling those of other marine animals. Sponges are sessile and digestion is very simple without any apparent way of capturing food or eliminating wastes.