Which of the following organisms possess a fo | vedclass

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(D) Most reptiles possess a three-chambered heart,consisting of two atria and one partially divided ventricle. However,members of the order $Crocodili

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Birds and Crocodilia

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(D) Most reptiles possess a three-chambered heart,consisting of two atria and one partially divided ventricle. However,members of the order $Crocodilia$ (such as crocodiles and alligators) possess a completely four-chambered heart,similar to birds and mammals. Birds $(Aves)$ also possess a four-chambered heart. Therefore,both birds and crocodilians have a four-chambered heart.

Column-$I$	Column-$II$ (Phylum)	Column-$III$ (Example)
$I$. Water canal system	$a$. Porifera	$p$. Sea lily
$II$. Proboscis	$b$. Hemichordata	$q$. Sepia
$III$. Water vascular system	$c$. Mollusca	$r$. Sycon
$IV$. Shell	$d$. Echinodermata	$s$. Balanoglossus

Which of the following organisms possess a four-chambered heart?

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