Which aortic arch is present in mammals?

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Question

(B) In mammals,the systemic arch is derived from the left fourth aortic arch of the embryo. During embryonic development,the right fourth aortic arch

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Only the left aortic arch

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(B) In mammals,the systemic arch is derived from the left fourth aortic arch of the embryo. During embryonic development,the right fourth aortic arch regresses and becomes vestigial,while the left fourth aortic arch persists to form the systemic arch (aortic arch). Therefore,mammals possess only the left aortic arch.

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