What do birds possess in their aortic arches?

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(A) In birds (Class $Aves$),the systemic circulation is characterized by the presence of only the right systemic arch (aortic arch). During embryonic

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$A$ single right aortic arch

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(A) In birds (Class $Aves$),the systemic circulation is characterized by the presence of only the right systemic arch (aortic arch). During embryonic development,both arches are present,but the left systemic arch degenerates,leaving only the right one to persist in the adult. This is a distinct feature compared to mammals,which possess only the left systemic arch.

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