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.

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