In amphibian, the heart has

Two atria and two ventricles

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Two atria and one ventricle

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One atria and two ventricles

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One atrium and one ventricle

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Solution

The correct option is B Two atria and one ventricle
Vertebrates are characterised by the presence of a clearly defined and well formed heart. Fishes have a 2 chambered heart(1 atrium and 1 ventricle), amphibians 3 chambered(2 atria & 1 ventricle), reptiles also 3 chambered except crocodiles which have an incompletely 4 chambered heart(2 atria & 2 ventricles), birds and mammals have a completely 4 chambered heart.

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