Though they evolved from a torted ancestor,opisthobranchs have undergone various degrees of _________________.
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Q16: The Monoplacophora
A)lack a shell.
B)live in fresh water.
C)have
Q17: Some bivalves have an operculum which prevents
Q18: Locomotion in most of the Bivalvia is
Q19: Chitons have eight plates embedded in their
Q20: The nudibranchs belong to the
A)ProsobranchiA.
B)Opisthobranchia.
C)Pulmonata.
D)Scaphopoda.
Q22: The empty chambers of Nautilus are connected
Q23: The circulatory system of cephalopods is more
Q24: Most cephalopods can move by a kind
Q25: The pulmonate snails lack gills,and their mantle
Q26: Torsion in gastropods caused the mantle cavity
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