Sea sponges have varied shapes, some are radial symmetry, but some are irregular. This spicula is made of protein mesh, spongil, and calcium carbonate, as a defense against predators. In fact, the body of a sea sponge has two layers, a layer of jelly called mesohyl and which spicules have a thorny or hairy structure. The fact is the body of the sea sponge does not move, this causes them cannot avoid from predators. However, there are several species of marine sponges that live in fresh water as well. They are mostly seen in tidal zones to a depth of 8000 meters. Sea sponges are water creatures that do not move. Species of this sea sponges are found in tropical regions up to the poles. It is said that there are 5,000 species of sea sponges that exist throughout the world. Sea sponges are not only live in the ocean, some species of sea sponges are found in freshwater lakes and also the rivers. They can also live well on hard surfaces such as on rocks or soft surfaces like sand. Sea sponges are water creatures that usually live in clear and, calm waters. It helps the digestive and respiratory systems in sea sponges. The movement of water carried by choanocytes. All food nutrition is filtered by sea sponge. ![]() Choanocyte creates a stream of water through the body of a sea sponge. The food particles that enter the sea sponge will be captured by a flap called choanocyte. The main food of sea sponge is a very small particle such as bacteria, dinoflagellate, and nanoplankton. ![]() The sea sponges usually only filter seawater or sea breathing in and out of these pores and taking in any bacteria, plankton that will serve as food. Sea sponges do not have a mouth like the other sea animals.
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