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Jaws evolved _____. see concept 34.3 (page 724) view available hint(s) jaws evolved _____. see concept 34.3 (page 724) from the rasping tongue from the bony armor of ostracoderms from arthropod jaws by modification of the skeletal rods that previously supported the anterior pharyngeal gill slits by modification of middle ear bones

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I think the appropriate answer is that Jaws evolved by modification of the skeletal rods that previously supported the anterior pharyngeal gill slits. 
According to a leading hypothesis, this marked a reduction in the number of pharyngeal gill slits an a change in the function of gills from feeding to respiration. 

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