Jaws Appear to Have Evolved from

Multiple Choice

Jaws appear to have evolved from

A) the fusion of many bony elements found in the skin of the neck region of jawless ancestors.
B) a large, bony shield that protruded from between the base of the pectoral fins.
C) modification of a disk of bones surrounding the mouth in lampreys.
D) skeletal rods that supported gill slits near the mouth.