How do jelly fish see?

All cnidarians have a mouth in the center of their bodies, surrounded by tentacles. The jellyfish's cnidarian relatives include corals, sea anemones and the Portuguese man-o'-war. Jellyfish are about 98 percent water. If a jellyfish washes up on the beach, it will mostly disappear as the water evaporates. Most are transparent and bell-shaped. read more

Most jellyfish do not have specialized systems for osmoregulation, respiration and circulation, and do not have a central nervous system. Nematocysts, which deliver the sting, are located mostly on the tentacles; scyphozoans also have them around the mouth and stomach. read more

," asked a student in Amy Mueller's fourth grade class at Hoover Math and Science Academy in Schaumburg. A jellyfish is not a fish and has very little jelly. The floating balloon-like sea creature is 95 percent water. Sandwiched between two layers of skin is a jellylike substance called mesoglea. read more