1.

The heart of an amphibian is usually(a) two-chambered(b) three-chambered(c) four-chambered(d) three and half-chambered

Answer»

Answer is : (b) three-chambered

Vertebrate hearts can be categorised by the number of chambers they have, like two-chambered (one atrium and one ventricle) in fishes, three-chambered (two atria and one ventricle) in amphibians and reptiles; and four-chambered (two atria and two ventricles) in birds and mammals.



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