Class Chondrichthyes, Elasmobranchii and Holocephali
In members of subclass Holocephali, teethes are modified into:
dentine
jaws
crushing plates
tail
crushing plates
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Sharks, ratfishes, and rays are included in classA. chordata
B. Chondrichthyes
C. elasmobranchii
D. Holocephali
Sharks have a cartilaginous structure and it may become
A. calcareous
B. partially ossified
C. completely ossified
D. lignified
Pharyngeal slits in member of subclass Holocephali is covered with:
A. lid
B. lobe
C. operculum
D. jaws
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