Sponge, any of the primitive multicellular aquatic animals that constitute the phylum Porifera. They number approximately 5,000 described species and inhabit all seas, where they occur attached to surfaces from the intertidal zone to depths of 8,500 metres (29,000 feet) or more. The members of one
Sponges lifeunderwater259
Phylum Porifera Biology for Majors II
Sponge - Wikipedia
Purple Tube Sponge - Phylum Classification
Sponge Animal Facts Demospongiae - A-Z Animals
Phylum Porifera /ExploringOurFluidEarth
Amazing facts and secrets of sea sponges
No taxonomy needed: Sponge functional morphologies inform about environmental conditions - ScienceDirect
Sponge - Reproduction, Filtering, Habitat
What makes a sponge an animal? - Quora
What is a sponge?
Sponges CK-12 Foundation
Sponge Reproduction - Advanced