What Is A Sponge?

The Sponge is a type of an aquatic animal under the phylum Porifera. They are rudimentary and sessile creatures that pump water through their bodies in order to push out particles of food material. Sponges are essentially one of the simplest animals. They do not posses true tissues as well as muscles and internal organs. Their resemblance to choanoflagellates exhibits the possible leap of evolution from unicellular to multicellular beings.

There are above five thousand species of sponges that have been identified, and they can be found stuck to surfaces almost anywhere in water bodies. They possess no real circulatory system, although they make use of the water current to circulate. They also lack respiratory organs; this function is done through diffusing individual cells.