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Q.

Organisms with a four-chambered heart.

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a

Bird

b

human

c

crocodile

d

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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