In which of the following is a four-chambered | vedclass

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(A) The heart structure varies across different classes of vertebrates.$1$. Birds $(Aves)$ and mammals $(Mammalia)$ possess a completely four-chambere

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Snake

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(A) The heart structure varies across different classes of vertebrates.$1$. Birds $(Aves)$ and mammals $(Mammalia)$ possess a completely four-chambered heart.$2$. Crocodiles are unique among reptiles as they also possess a four-chambered heart.$3$. Snakes belong to the class $Reptilia$ (excluding crocodiles),which typically possess a three-chambered heart (two atria and one partially divided ventricle).Therefore,a four-chambered heart is not found in snakes.

In which of the following is a four-chambered heart $NOT$ found?

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