Incomplete double circulation is found in

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(C) Incomplete double circulation is a characteristic feature of $Amphibians$ and most $Reptiles$ (except crocodiles).In these organisms, the heart is

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Amphibians

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(C) Incomplete double circulation is a characteristic feature of $Amphibians$ and most $Reptiles$ (except crocodiles).In these organisms, the heart is $3$-chambered, consisting of two atria and one ventricle.The oxygenated blood from the lungs/skin and deoxygenated blood from the body are mixed in the single ventricle before being pumped out.This mixing of blood results in an incomplete double circulation.

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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Match the following columns:
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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