The evolutionary relationship can be traced by observing the following things:-

(i) Homologous organs:- homologous organs are the one which have same structure performing different functions. It shows the same ancestral history.

(ii) Analogous organs:- organs which have different structures performing the same function. It shows convergent evolution

(iii) Fossils:- fossils are dead remnants of plants & animals living on earth far back. Fossils provide us with a way to peep into the window of history and to earn a lot about them. Fossils play a major role in tracing evolutionary relationships.