During chordate evolution, what is the sequence (from earliest to most recent) in which the following structures arose?
A) paired fins, jaws, swim bladder, amniotic egg, four-chambered heart
B) jaws, paired fins, swim bladder, four-chambered heart, amniotic egg
C) jaws, paired fins, paired fins, swim bladder, four-chambered heart
D) paired fins, amniotic egg, four-chambered heart, jaws, swim bladder
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