Why are fossils considered important in the study of evolution? Explain two ways by which age of fossils can be estimated.

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Fossils provide evidence in favour of evolution. They establish evolutionary relationships by providing missing links. Age of fossils can be determined by the following ways: 

(i) Relative method – Fossils found closer to the surface are more recent than those in deeper layer. 

(ii) By detecting the ratios of different isotopes of the same element in the fossils material.

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