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In mammalian embryo the pulmonary aorta ...

In mammalian embryo the pulmonary aorta communicates with carotico-systemic aorta by a narrow ductus arteriosus, in the adult this connection closes learving `:-`

A

Fossa -ovalis

B

Carotico pulmonary aperture

C

Ligamentum arteriosus

D

None of these

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