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Q.

Select the correct combination.

 AnimalHeartCirculation
1FrogThree-chamberedComplete double
2FishTwo-chamberedSingle
3CrocodileThree-chamberedIncomplete double
4PigeonFour-chamberedSingle

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a

1

b

2

c

3

d

4

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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