Jellyfish jelly Fish fish underwater about Mediterranean Sea Ocean

>For other uses of the word underwater, see Underwater (disambiguation) Underwater, sometimes shortened as U/W, is a term describing the realm below the surface of water where the water exists in a natural feature (called a body of water) such as an ocean, sea, lake, pond, or river. Three quarters of the planet earth is covered by water. A majority of the planet's solid surface is abyssal plain, at depths between 4000 and 5500 m (13,000 to 18,000 ft) below the surface of the oceans. The solid surface location on the planet closest to the center of the orb is the Challenger Deep, located in the Mariana Trench at a depth of 10,924 m (35,838 ft) under the sea. See more at Wikipedia.org...

>This article is about jellyfish, the sea creatures. For the pop band, see Jellyfish (band). Stauromedusae Coronatae Semaeostomeae - Disc jellyfish Rhizostomae Jellyfish (also called jellies or sea jellies as they are not true fish, nor are they made of jelly) are animals that belong to Phylum Cnidaria, included in the class Scyphozoa (from Greek skyphos "cup" and zoon "animal"). The name "jellyfish" is also often used for the related classes of medusae (Hydrozoa) and box jellyfish (Cubozoa). Almost all jellyfish live in the seas and though they lack true organ structures they feature specialized tissues. The adult forms of these creatures are composed of 94-98% water. All species are found in each of the world's oceans, with a few species living in fresh water. Most jellyfish are passive drifters that feed on small fish and zooplankton that become caught in their tentacles. Jellyfish have an incomplete digestive system, meaning that the same orifice is used for both food intake and waste expulsion. They are Coelenterates which means "hollow gut", and are made up of a layer of epidermis, gastrodermis, and a thick jelly-like layer called mesoglea that separates the epidermis from the gastrodermis. See more at Wikipedia.org...