Select the correct combination.
Animal Heart Circulation
1 Frog Three-chambered Complete double
2 Fish Two-chambered Single
3 Crocodile Three-chambered Incomplete double
4 Pigeon Four-chambered Single

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answer is B.

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Detailed Solution

Fishes have a two-chambered heart and their blood circulation is single circulation. Frogs have a three-chambered heart. Crocodiles have a four-chambered heart. Double circulation occurs in pigeons (Aves).

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