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Select the correct combination.
Animal Group Heart Circulation
1. Amphibians 3-chambered Complete double circulation
2. Fishes 2-chambered Single circulation
3. Birds 4-Chambered Incomplete double circulation
4. Crocodiles 3-chambered Complete double circulation

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answer is B.

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Detailed Solution

Fishes possess a 2-chambered heart. Single circulation occurs in them.

Incomplete double circulation occurs in amphibians.

Complete double circulation occurs in birds and mammals.

Crocodiles have a 4-chambered heart.

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