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Crocodiles resemble mammals by the presence of

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four-chambered heart

epidermal scutes

ear pinna

dicondylic skull

answer is A.

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Detailed Solution

Crocodiles resemble mammals by the presence of a four-chambered heart. Scutes are absent in mammals. Pinna is present only in mammals. Skull of crocodiles (reptiles) is monocondylic while that of mammals is dicondylic.

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