Most Mollusks have a soft body protected by a hard shell of calcium carbonate.
Several species of Mollusks however, have lost their shell during evolution or have internalized it, in the case of octopuses and squids. Despite the differences, all mollusks have similar body plans. Each body part varies depending on the class of mollusca. Oval shaped and shelled marine animals divided into eight dorsal plates. Uses its muscular foot as a suction cup to attach to sides of rocks in close proximity of water.