Question

How do animals of porifera

Answer 1

Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. ... Many sponges have internal skeletons of spongin and/or spicules of calcium carbonate or silicon dioxide. All sponges are sessile aquatic animals.

Answer 2

Sponges, the members of the phylum Porifera, are a basal Metazoa clade as a sister of the Diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. 
Kingdom:Animalia Phylum:Porifera