Answer:
Pisces (fishes) have only two chambered hearts, e.g.,
Rohu, Scoliodon Amphibians have three chambered hearts except crocodiles, e.g.,
frog, salamander.
Reptiles also have three chambered heart, e.g., flying
lizard, king cobra.
Crocodiles have four chambered heart (an exception is
reptiles).
Aves warm blooded animals having four chambered heart,
e.g., ostrich, pigeon, bat, whale, etc.
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