What are fossils? What do they tell us about the process of evolution?
Fossils are preserved traces of living organisms. They are any impression or imprint left by some previous organism in the soft mud which subsequently hardened or the moulds and casts of entire organisms which became preserved.
Fossils tell about the organisms that lived long ago and help us to establish evolutionary relationship with the present organisms. They tell about the structure of such organisms and the time period during which they lived. The fossils found in upper strata of rocks are considered to be newer than those found in the lower strata. It is also seen from the fossils that the organisms become more complex in the upper strata when compared to the lower strata which indicates towards the evolutionary process.
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