In reptiles and amphibians,there is no clear- | vedclass

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(B) In fishes,the heart is $2$-chambered,consisting of one atrium and one ventricle.In amphibians and most reptiles (except crocodiles),the heart is $

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Ventricles are not partitioned completely

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(B) In fishes,the heart is $2$-chambered,consisting of one atrium and one ventricle.In amphibians and most reptiles (except crocodiles),the heart is $3$-chambered,consisting of two atria and one single ventricle.Because there is only one ventricle,the oxygenated blood received from the lungs/gills and the deoxygenated blood received from the rest of the body mix within the ventricle before being pumped out.Therefore,there is no clear-cut separation of oxygenated and deoxygenated blood.

In reptiles and amphibians,there is no clear-cut separation of oxygenated and deoxygenated blood because they have

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