(B) $Sternohyal$ and $petrohyal$ muscles help in the respiration of frogs.Contraction of the $sternohyal$ muscle during breathing in frogs lowers the

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(B) $Sternohyal$ and $petrohyal$ muscles help in the respiration of frogs.Contraction of the $sternohyal$ muscle during breathing in frogs lowers the floor of the oral cavity.Contraction of the $petrohyal$ muscle during breathing in frogs raises the floor of the buccal cavity.