Question

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2. Answer the following questions
A Reptiles are known for having three
chambered heart. Which animal shows a
near four chambered condition in reptiles?
B. The circulatory system has evolved from
open to closed type in Animal Kingdom.
Which Phylum can be called first to
represents closed circulation?
C. Pinna is part of external ear and it is found
in mammals. Do aves and reptiles show
external ear in any form?
D. Fish and frog can respire in water. Can
they respire through their skin? If yes.
why do they have gills?​

Answer 1

the heart of crocodile is having nearly four chambered