Multiple choice

Swim bladder is generally present in _____.

  1. jawless fish

  2. ray fish

  3. bony fish

  4. cartilaginous fish
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A swim bladder is a gas-filled organ that helps bony fish maintain buoyancy. It is absent in cartilaginous fish, which rely on other methods like large oily livers.

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