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