In which of the following organisms does the | vedclass

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(A) The heart of a shark (a cartilaginous fish) is two-chambered,consisting of one atrium and one ventricle. It receives deoxygenated blood from the b

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Shark

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(A) The heart of a shark (a cartilaginous fish) is two-chambered,consisting of one atrium and one ventricle. It receives deoxygenated blood from the body and pumps it to the gills for oxygenation. Therefore,the heart only pumps deoxygenated blood. In contrast,whales are mammals (four-chambered heart),while frogs and lizards are amphibians and reptiles,respectively,which have three-chambered hearts that pump mixed blood.

In which of the following organisms does the heart pump only deoxygenated (impure) blood?

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