Unlike in all other living mollusks, in _______ the gas exchange organs, muscles, and excretory pores are repeated over the length of the body.These organisms were the most abundant mollusks during the Cambrian period, 500 million years ago, but only a few species survive today.

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Monoplacophorans are the only living mollusks in which the gas exchange organs, muscles, and excretory pores are repeated over the length of the body. They were most abundant during the Cambrian period and only a few species exist today. Chitons, cephalopods, bivalves, and gastropods do not exhibit this characteristic.

Unlike in All Other Living Mollusks, in _______ the Gas