A) Its teeth are modified placoid scales which an backwardly directed.
B) It has 5 to 7 pair of gills for respiration but without operculum (i.e., gill cover).
C) The air bladder is absent so that they have to swim constantly to avoid sinking.
D) In males, the pelvic fins claspers are absent.
Correct Answer: D
Solution :
Sexes are separate with sexual dimorphism. Males have claspers or copulatory organs. Fertilization is internal, the most common forms are ovoviviparous or oviparous, and however, sharks are viviparous.
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