Fossils are the remains of the organism that once existed on earth. They represent the ancestors of the plants and animals that are alive today. They provide evidences of evolution by revealing the characteristics of the past organisms and the changes that have occurred in these organisms to give rise to the present organisms.
(i) Study of fossils allow us to make estimates of how far back evolutionary relationship go between organisms.
(ii) Study of age of fossils allows us to know which organisms evolved earlier and which later.
