During branchial respiration :

During branchial respiration :

  1. A

    Fish keeps its mouth open and lowers the floor of the oral cavity

  2. B

    Fish keeps its mouth closed and lowers the floor of the oral cavity

  3. C

    Fish keeps its mouth open and raises the floor of the oral cavity

  4. D

    Fish keeps its mouth closed and raises the floor of the oral cavity.

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