Which type of scales are found on the skin of cartilaginous fishes?

  • A
    Ganoid
  • B
    Placoid
  • C
    Ctenoid
  • D
    Cycloid

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Which of the following organisms possesses a closed circulatory system?

Which fin is heterocercal (asymmetrical) in cartilaginous fishes (Chondrichthyes)?

$S$ - Statement: Shark is an example of cartilaginous fish.
$R$ - Reason: The endoskeleton is made of cartilage.

In $Scoliodon$,what type of fertilization is observed?

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