Write the classes of phylum Mollusca with one characteristic feature and one example of each.

The organisms belonging to phylum Mollusca exhibit the following characteristics:

• The body is divided into head, visceral mass, muscular foot and mantle.
• The head comprises of tentacles and compound eyes.
• They exhibit organ system level of organization.
• Their body has a cavity.
• They have a well-developed digestive system, the radula is the rasping organ for feeding.
• They respire through the general body surface, gills or pulmonary sac.
• The blood circulates through the open circulatory system.
• They have a pair of metanephridia that helps in excretion.
• The body is covered by a calcareous shell.
• The muscular foot helps in locomotion.
• They are mostly found in marine and freshwater. Very few are terrestrial and found in moist soil.
• The sexes are separate in most of the molluscs but ______ __________ ___ _________ ____ _________ ________ ________ ________ __________ ____ _____.
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