First slide

Classification of Animals

Question

An undivided atrium in the heart is a character of the class

Easy

A

Amphibia
B

Reptilia
C

Aves
D

Pisces

Solution

Fishes have a two-chambered heart with one atrium and one ventricle. Both atrium and ventricle are undivided.
In amphibians, reptiles and birds, the atria is divided into two chambers.

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