Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal Metazoa (animal) 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. The branch of zoology that studies sponges is known as spongiology.

Porifera. Retrieved May, 08 2021, from https://en.wikipedia.org/wiki/Sponge.