What structure would you expect to find in every type of mollusk (that is, gastropods, cephalopods, and bivalves)?

The options

a. hinge

b. tentacles

c. mantle

d. single-lens eyes

e. valve

The CORRECT ANSWER IS c.

c. mantle

Explanation:

Phylum: Mollusca (Mollusks)

Class: Polyplacophora (Chitons)

Class: Gastropoda (snails)

Class: Bivalvia (Clams)

Class: Cephalopoda (Nautilus, Squid, Octopus)

All mollusks possesses a visceral mass, a mantle, and a foot. The visceral mass houses the digestive, excretory, and reproductive organs. The mantle acts as a covering. It may produce a shell. The foot is muscular and is used for movement, griping, and/or food hunting.

Mantle, can also be termed the pallium, plural  pallia, or palliums, in biology. It as a soft covering (often toughened by calcified plates, of barnacles),

produced from the body wall, of brachiopods and mollusks.

It secretes the shell in organism that make use of shells. In bivalves, it is links edge may be joined at the edge to form siphons for directing water into and out of the mantle cavity.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .