The two chambered heart is observed in

fishes

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lizards

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frogs

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crocodile

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Solution

The correct option is A fishes
All vertebrates possess a muscular chambered heart.
Fishes have a 2-chambered heart with an atrium and a ventricle. Amphibians (frogs) and the reptiles (lizards) have a 3-chambered heart with two atria and a single ventricle.
Crocodiles (exception of reptiles), birds and mammals possess a 4-chambered heart with two atria and two ventricles.

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