ZoologyPetromyzon is classified under 

Petromyzon is classified under 

  1. A

    Gnathostomata because it has jaws

  2. B

    Agnatha because it lacks jaws

  3. C

    Chondrichthyes because it has cartilaginous endoskeleton

  4. D

    Cyclostomata because it has scales

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    Solution:

    Petromyzon is classified under the class Cyclostomata of Agnatha. Agnatha includes jawless vertebrates. It is classified into two classes: Ostracodermii (extinct) and Cyclostomata (extant). Cyclostomes lack scales. Their endoskeleton is cartilaginous but they are not included under Chondrichthyes. Petromyzon is not a gnathostome; it lacks jaws.

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