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Biology 17 Online
OpenStudy (anonymous):

what traits were derived after jaw bones

OpenStudy (zpupster):

After jaws, the next derived trait was the presence of lungs. The salamander, lizard, tiger, gorilla and human share a common ancestor that had lungs. The lamprey and shark do not share this ancestor, and they have gills instead of lungs. http://dtc.pima.edu/blc/182/lesson3/3step3/3step3page1.htm

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