Which circulatory system is absent in humans?

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(C) 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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Renal portal system

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(C) 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 humans, the $Hepatic$ $portal$ $system$ is present, which carries blood from the digestive tract to the liver.The $Renal$ $portal$ $system$ is a system where blood from the hind limbs or tail is transported to the kidneys before returning to the heart.This system is present in lower vertebrates like amphibians and reptiles but is absent in humans and other mammals.

Column-$I$	Column-$II$
$P$. Single circulation	$I$. Fishes
$Q$. Incomplete double circulation	$II$. Amphibians and Reptiles
$R$. Complete double circulation	$III$. Crocodiles,Birds,and Mammals

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Column-$I$ Column-$II$
$P$. Single circulation $I$. Fishes
$Q$. Incomplete double circulation $II$. Amphibians and Reptiles
$R$. Complete double circulation $III$. Crocodiles,Birds,and Mammals

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