(B) In mammals,the lower jaw is composed of a single pair of bones known as the $Dentary$ bones. Unlike other vertebrates where the lower jaw consists

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(B) In mammals,the lower jaw is composed of a single pair of bones known as the $Dentary$ bones. Unlike other vertebrates where the lower jaw consists of multiple bones,in mammals,the $Dentary$ is the only bone that forms the lower jaw and articulates with the squamosal bone of the skull. Therefore,the correct answer is $B$.