(i) List any four evidences of evolution.
(ii) Explain any one of the evidences that helps to understand the concept of evolution.

(i) Four Evidences of evolution
(a) Paleontological evidences.
(b) Morphological and anatomical evidences.
(c) Biogeographical evidences.
(d) Biochemical evidences.

(ii) Paleontological evidences:
(a) The study of fossils is known as paleontology.
(b) Fossils are the remains of or impressions of life forms of the past preserved in sedimentary rocks or in other media like volcanic ash or peat etc.
(c) Fossils are the written documents of evolution.
(d) The study of fossils reveals the existence of life in the past and illustrates the course of evolution of plants and animals.
(e) Rock sediments of different ages in the earth crust indicate the presence of fossils of different life forms.
(f) A variety of fossils ranging complex to simple and modern to extinct organisms can be observed.
(g) Study of fossils in different sedimentary layers indicate the geological period in which they existed and the geologic time is a chronological sequences or the history of evolution based on the study of fossils.
(h) For example fossils of earliest life consisted only of prokaryotes. Later on eukaryotes developed. The differences found in the fossils of different periods are due to changes in form, structure habits of organisms due to evolution.
(i) Fossil histories of some organisms has been studied and the best among them is that of modern horse. It has been found out that modern horse Equus and its relatives have evolved from eocene animal Eohippus as a result of number of changes in structure and habit which have occurred during the course of evolution.