Thecodont teeth and four chambered heart occur in:

Crocodilia

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Viperidae

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Lacertilia

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Chelonia

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Solution

The correct option is A Crocodilia
Thecodont teeth are those teeth in which root of the tooth is firmly fixed in a socket of the jawbone, making the attachment strongest. It is present in vertebrates. Crocodiles have a four-chambered heart, the only exception among reptiles.
Therefore, the correct answer is option A.

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The four-chambered heart is found in

Draco

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