Problem: Which one of the following is incorrect concerning molluscs?A. Some members of the Phylum Mollusca are filter feeders.B. All members of the Phylum Mollusca have a radula.C. Not all members of the Phylum Mollusca have an external shell.D. Some members have direct development and do not produce larval stages.

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Mollusks (phylum Mollusca) are coelomates with three main body parts: the muscular foot, a visceral mass with its internal organs, and a mantle. Having more than 100,000 species, they have a number of unique differences. 

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Problem Details

Which one of the following is incorrect concerning molluscs?

A. Some members of the Phylum Mollusca are filter feeders.

B. All members of the Phylum Mollusca have a radula.

C. Not all members of the Phylum Mollusca have an external shell.

D. Some members have direct development and do not produce larval stages.