(C) The phylum $Mollusca$ exhibits a diverse range of respiratory mechanisms. Some molluscan animals,such as certain gastropods,show both aquatic and

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(C) The phylum $Mollusca$ exhibits a diverse range of respiratory mechanisms. Some molluscan animals,such as certain gastropods,show both aquatic and aerial modes of respiration. These animals possess a gill (ctenidium) for aquatic respiration and a pulmonary sac or lung for aerial respiration.