The portal system seen in all vertebrates is

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(A) portal system is a system of blood vessels in which blood collected from one capillary bed is transported to another capillary bed before returnin

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Hepatic

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(A) portal system is a system of blood vessels in which blood collected from one capillary bed is transported to another capillary bed before returning to the heart.In all vertebrates,the hepatic portal system is present,which carries blood from the digestive tract to the liver.The renal portal system is present in lower vertebrates like fishes,amphibians,and reptiles,but it is absent in birds and mammals.Therefore,the hepatic portal system is the only one common to all vertebrate groups.

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