First slide
Classification of Animals
Question

Which one of the following animals has two separate circulatory pathways?

Moderate
Solution

Two separate circulatory pathways mean complete double circulation. It is observed in birds and mammals. Whale is a member of class Mammalia with 4 chambered heart and exhibits complete double circulation.

Shark-Single circuit system

Frog-Incomplete double circulation

Lizard-Incomplete double circulation

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