Organisms with a four-chambered heart.

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Bird

human

crocodile

None of the above

answer is A.

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Detailed Solution

Heart is divided into chambers. In fish the heart is divided into 2 chambers in reptiles and in amphibians heart is divided into 3 chambers and in mammals heart is divided into four chambers.

Birds, humans and crocodiles have four chambers in the heart.

Crocodile is a reptile but has four chambers in its heart.

Hence, options A,B and C are the correct options.

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Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE