They have killed people. Some octopus also have a potent venom that can cause death to humans. There are no known mollusks lethal to humans in waters around the United States of America. Next Question 12. Murex shells are capable of drilling through a clam shell to have a clam dinner.
Periwinkles eat seaweed.
Next Question 11. Pollution indirectly destroys mollusk populations as well as other sea life, by changing the availability of nutrients and sunlight. It also kills them directly if the pollution is a poisonous chemical. Shoreline development destroys molluscan habitats by dredging or filling where they live, and the silt left suspended in the water suffocates many mollusks directly or smothers their food source. Commercial shell fisheries that provide edible mollusks to seafood lovers, and commerical shell collecting, can damage mollusk populations but have done less damage than sewage and other waste that man dumps into the waters.