Give an account of evolution of aortic arches in reptiles, birds and mammals. (UPSC 2017, 20 Marks, )

सरीसृपों, पक्षियों और स्तनधारियों में महाधमनी चापों के विकास का वर्णन करें। (Give an account of evolution of aortic arches in reptiles, birds and mammals.)

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Give an account of evolution of aortic arches in reptiles, birds and mammals. (UPSC 2017, 20 Marks, )