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प्रश्न
Two chambered heart occurs in
विकल्प
crocodiles
fish
aves
amphibians
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उत्तर
fish
Explanation -
Fish (Class Pisces) have a two-chambered heart with an atrium and a ventricle (exception being lungfish which have a three-chambered heart). Amphibians (Class-Amphibia) and reptiles (except crocodiles and their relatives) have three-chambered hearts with two atria and one ventricle. Crocodiles and birds (Class-Aves) and mammals have four-chambered hearts with two atria and two ventricles.
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