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) |
