Left aortic arch is found in:

Some animals

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All mammals

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Not present

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Only man

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Solution

The correct option is B All mammals
All the mammals possess four-chambered heart with aortic arch. It is the main artery which bends between the ascending and descending aorta and creates arch. The left-sided aortic arches are unique to all mammals.
Thus, the correct answer is option B.

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