Refer to the figure. 
What modification in jaw structure occurred in early jawed fishes that was not found in jawless fishes at that time?
A) A set of gill arches was modified into supports for the jaws.
B) Gill arches were modified to form jaws.
C) Teeth developed on the jaws.
D) The anterior part of the skull was modified to form jaws.
E) Teeth formed from posterior gill arches.
Correct Answer:
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A)
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