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The animals having two-chambered heart belongs to the class? 

A. Amphibia 

B. Reptilia 

C. Pisces 

D. Aves

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Fishes have two-chambered heart, the upper one is the auricle whereas the lower one is the ventricle. From the body the deoxygenated blood is carried to the auricle then from here it is transported to the ventricle and then to the gills for oxygenation.

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