Sponges belong to which one among the following phylum?

Sponges belong to the phylum Porifera. The name Porifera means 'pore-bearing,' referring to the numerous small pores (ostia) on the body through which water flows in, and a larger opening (osculum) through which water flows out. Sponges are the simplest multicellular animals, lacking true tissues and organs. They have a cellular grade of organization and possess specialized cells like choanocytes (collar cells) for filter feeding. Platyhelminthes are flatworms, Cnidaria includes jellyfish and corals (with stinging cells), and Annelida includes segmented worms like earthworms and leeches.