swimming crab,and the bat crab. Mollusk shells are made of limestone. There are three main
types of mollusks: without shells, with two shells or bivalves. Some species of mollusks have toxic stingers for self-protection and for catching food. Some of them may be highly poisonous rendering their victim unconscious and even causing death. A large group of sea creatures at the coral reef is fishes. Marine scientists have found that