Members of the class Monoplacophora were believed extinct until some living specimens were found off the coast of Costa Rica in 1952.
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Q2: The cephalopods are the marine active predators.
Q3: In coelomate animals,the coelom
A)develops as a secondary
Q4: The Polyplacophora
A)have a coiled shell.
B)live in the
Q5: The molluscs are the second most diverse
Q6: The water current in the body of
Q8: Concerning reproduction in Bivalvia,
A)they tend to be
Q9: Most molluscs are found in fresh water,but
Q10: The mantle cavity in a mollusc houses
Q11: The cephalopod _ has a mantle length
Q12: Molluscs are important to humans because of
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