The heart of $Catla$ is composed of which chambers?

  • A
    One atrium and one ventricle
  • B
    Two atria and two ventricles
  • C
    Two atria and one ventricle
  • D
    Two atria and an incompletely divided ventricle

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Which of the following statements is $NOT$ true for bony fishes (Osteichthyes)?

Which one is a true fish?

Which of the following fishes possesses an air bladder?

Which of the following is a characteristic feature of $Osteichthyes$ (bony fishes)?

Fishes having a swim bladder,which does not have direct communication with the exterior and where the resorbent and secretory parts are not sharply separated from one another,are called:

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