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Study of fossils strengthen theory of evolution

How does study of fossils strengthen theory of evolution?

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The study of fossils discloses ancient and extinct species having various similar structures to others of present and of past. Fossils still permit radioactive dating to the estimate periods throughout which species lived and to set up a chronological relationship between them. Those evidences strengthen the hypothesis of relationship and common origin between species and that their functions have modified gradually till the formation of current species.

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