You need to explain to your study group why the breathing ability of amniotes is different than that of amphibians. Your classmates argue that something like a terrestrial salamander is identical in its breathing mechanism to an amniote. To convince them of the critical breathing innovations of amniotes, you report that in order to breathe as an amniote does, the terrestrial salamander would have to
A. reduce the size of its mouth.
B. grow lungs.
C. grow scales on its body.
D. develop new muscular associations in the ribcage.
Answer: D
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