FOSSIL, These are traces of organisms that lived in the past and were preserved by natural process or catastrophic events., COMPARATIVE ANATOMY, It is the study of the similarities and differences in the structures of different species., EMBRYONIC DEVELOPMENT, The portion of the life cycle that begins just after fertilization. Many organism have similar embryo supporting the idea of common ancestor., GENETIC INFORMATION, The organism which are similar in structure and also possess similarity at the biochemical level could probably have a common ancestor.

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