Introduction: Evolution is defined as the changes that occur in an organism in order to adapt itself to its environmental surroundings over a course of time which may be several thousand years or a generation. Get Evolution Assignment Help by Tutorspoint experts.
Evolution plays a very critical role in creating vast diversity of the organisms present on the earth. Evolution keeps the basic characteristic features same for generations after generations but varies phenotype characteristics, intellectual ability and the capacity to sustain environmental conditions.
Robert Charles Darwin is known as the father of evolution, as he had proposed the first theory of evolution. Darwin’s theory explained that life evolved from simple forms such as ammonia (nitrogen), methane (carbon and hydrogen), hydrogen sulphide and water, which pre-existed on earth to form more complex forms of life.
Fossils are essential information to study the ancestry of organisms previously existing in our planet. When organisms die, some body parts of the organism might not be decomposed easily and remain hardened in mud or rocks retaining impression of the body of the organism. These impressions are known as fossils.
Evolution by stages:
Evolution occurs by stages due to error copying mechanism of DNA occurring during cell division which varies from generation after generation. Evolution is seen in all the organisms as all organisms need to survive and adapt to the environmental conditions.
Changes of DNA occurring during cell division can be traced back in order to determine its ancestry. The organisms which are distantly related show vast differences in their genetic material. This type of study understands the evolutionary relationships between the organisms.