Mammals are the only living vertebrates in which jaw articulation occurs between the

 Mammals are the only living vertebrates in which jaw articulation occurs between the

squamosal of the skull and the dentary of the mandible. What previous change(s) in skeletal structure pre dated this jaw articulation in mammals?

Transformation of the quadrate into the incus and the articular into the malleus in mammals, joining the stapes appearing in amphibians

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