Right aortic arch is present in?

Mammals only

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Birds only

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Both reptiles and birds

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Both birds and mammals

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Solution

The correct option is B Birds only
Out of the 6 aortic arches formed during the embryonic development, only 3 are retained in the adult humans and birds- the third, the fourth, and the sixth. Birds and mammals differ in terms of the systemic aorta in the respect that in birds, it is on the right side, while in humans it is on the left side.

So, the correct answer is 'Birds only'.

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