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An Intiative by Sri Chaitanya
a
1
b
2
c
3
d
4
answer is B.
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Detailed Solution
Amphibians (e.g., frog) have a three-chambered heart and their blood circulation is incomplete double circulation. Fishes have a two-chambered heart. Crocodiles have a four-chambered heart. Double circulation occurs in pigeons (Aves).