Ключевые слова: animal, aquarium, beach, calcium, carbonate, clam, conch, coral, creature, crustacean, design, diving, evolution, gastropod, island, life, marine, mollusca, mollusk, nature, nautilus, ocean, prehistoric, primitive, reef, scuba, sea, seashell, seastar, shell, snail, snorkeling, spiral, starfish, tropical, water, whelk,