How does structure of heart represent order of evolution?

Answer»

Comparative study of hearts of fish, frog, snake and man shows that structure of fish is simplest of all and structure of human heart is more complex. This shows a certain order of evolution.

The table represents the same as:

S.No.	Animal Name	Structure of heart
1	Fish	Two chambers (One auricle and one ventricles)
2	Frog	Three chambers (Two auricles and on ventricles)
3	Snake	Two auricles and two incomplete ventricles
4	Human	Four chambers (Two auricles and two ventricles)

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How does structure of heart represent order of evolution?

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