Only left aortic arches are present in

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(C) In mammals,the systemic arch is derived from the left fourth aortic arch,meaning only the left aortic arch persists. In birds,the systemic arch is

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Mammals

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(C) In mammals,the systemic arch is derived from the left fourth aortic arch,meaning only the left aortic arch persists. In birds,the systemic arch is derived from the right fourth aortic arch. In reptiles (including the order Crocodilia),both left and right systemic arches are present. Therefore,only mammals possess exclusively the left aortic arch.

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