The two uses of fossils are :
(i) Racial history of plants.
(ii) Past climatic conditions of earth.
Study of fossils provides evidence in favour of organic evolution because:
(i) Fossils helps to identify an evolutionary relationship between apparently different species.
(ii) The fossils present in the bottom rocks are simple while the most recent fossil found in the upper strata are highly complex. This geographical succession completely agrees with the concept of evolution.
