A. Jaws
B. paired appendages
C. Gills
D. Both A,B
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The correct answer to the question: "Two major developments in vertebrate evolution were the appearance_______ and_______?" is "Both A,B".
A. Jaws
B. paired appendages
C. Gills
D. Both A,B
The correct answer to the question: "Two major developments in vertebrate evolution were the appearance_______ and_______?" is "Both A,B".
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