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The given figures A, B, C and D are the examples of first true land vertebrates. They are dominant in mesozoic era and belong to phylum ‘X’. Identify ‘X’ and the animals which have four chambered heart. 
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A. X – Reptile; B

B. X – Reptile; A

C. X – Amphibia, C

D. X – Pisces; D

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Correct Answer :

A. X – Reptile; B


The given figures (A, B, C and D) are respectively chameleons, crocodile, turtle and cobra. Reptiles are the first true land vertebrates and dominant in Mesozoic era. They are cold blooded vertebrates. Heart in reptiles are usually three chambered but four chambered in crocodiles.

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