Give two uses of fossils. How does the study of fossils provide evidence in favour of organic evolution?

Explanation

Evolution the process of change from simple life forms to complex life forms by gradual change. It is generating diversity and shaping the diversity.
(i) It occurs over the course of time and generations by variation speciation, natural selection, genetic drift etc. fossil are the preserved traces of living organisms.
(ii) It helps us to find the intermediate forms in between two classes etc. For example fossil of Archaeopteryx helps us to know better about the intermediate form between reptiles and aves.
(iii) It it tells us about the extinct species through the fossil or their retained body impressions.
(iv) It helps to know the evolutionary relationships.
(v) This also shows the line of development from primitive to complex organisms. eg. Ammonite trilobite, Orthoceras etc. according to the depth of the layer in which it is found.