(a) What are fossils ?
(b) Explain the importance of fossils in evolutionary relationship.
(a) Impressions of the body parts of the organisms and preserved traces of the living organisms are called fossils.
(b) The presence of fossilized remains of the organism is the evidence of existence of organisms million years ago which have now become extinct. Fossils also help in determining the connecting links between various groups and their origin from their primitive ones.