What is the difference between gastropods and bivalve molluscs? What are their similarities?

In gastropods, the shell is efficient, often symmetrical, and in bivalves, it consists of two valves. The head, trunk and leg can be distinguished in gastropods; in bivalves, the head is generally absent. Gastropods have well-developed sense organs of touch, chemical sense, balance and vision. In bivalves, the sense organs are very poorly developed. Bivalves are aquatic animals, while gastropods inhabit both aquatic and terrestrial-air environments.

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