According to One Hypothesis, the Jaws of Vertebrates Were Derived

question 33

Multiple Choice

According to one hypothesis, the jaws of vertebrates were derived by the modification of

• A)scales of the lower lip.
• B)skeletal rods that had supported pharyngeal (gill)slits.
• C)one or more gill slits.
• D)one or more of the bones of the cranium.
• E)one or more of the vertebrae.

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