Question

Which organisms shows Single circulation, Incomplete double circulation and complete double circulation. ​

Answer 1

Single circulation

• Pisces (fishes) ----- 2 chambered heart

Incomplete double circulation

• Amphibians ----- 3chambered heart
• Reptiles (except -- Crocodile) ----- 3 chambered heart

Complete double circulation

• Aves ( Birds) ------ 4 chambered heart
• Mammals ------- 4 chambered heart.

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