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What are fossils ? How are they an evidence for evolution?

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Fossil-remains/impression of hard parts of lifeforms existed in past, preserved in sedimentary rocks volcanic ash, peat etc. They are written documents of evolution. 

Study of fossils in different sedimentary layers indicates the geological periods in which they existed, and showed that life forms varied over time. This indicates that new forms of life have evolved at different geological times in the history of earth.

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