The Empty Chambers of Nautilus Are Connected by a Cord

Q21: Because of "coiling," most gastropods can be

Q22: Molluscs evolved in fresh water,and therefore the

Q23: The cephalopod _ has a mantle length

Q24: The water current in the body of

Q25: The tongue-like,rasping organ in the head of

Q27: The _ is a rod in the

Q28: Most molluscs are found in fresh water,but

Q29: The Monoplacophora<br>A)lack a shell.<br>B)live in fresh water.<br>C)have

Q30: The edible clams,oysters,and scallops belong to the

Q31: The most primitive conditions in today's molluscs