A)with the incurrent siphon upstream.
B)with the excurrent siphon upstream.
C)in any direction,since it can control which way the water flows in either siphon.
D)either with the incurrent siphon upstream or with the excurrent siphon upstream,but not in any direction,since it can control which way the water flows in either siphon.
E)None of the choices is correct

A)live free on the sea bottom and feed on cnidarians.
B)have a shell of eight articulating plates.
C)resemble the squids.
D)are called chitons.
E)have the primitive radula and gill mollusc plan.

A)are mostly worm-like,burrowing,marine organisms.
B)possess an oral shield associated with food selection and intake.
C)possess a radula (reduced in some species).
D)may have more features in common with the common ancestor of all molluscs than any other living group.
E)All of the choices are correct