In which of the following class/es of vertebrates there are groups of animals that posses 2 chambered heart?
A
Amphibians only
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B
Fish, reptiles and mammals
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C
Reptiles and Amphibians
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D
Fishes only
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Solution
The correct option is D Fishes only Fishes have only two chambers of the heart- the atrium and ventricle.
The oxygenation of blood happens through the gills.