Describe the Darwin's theory of natural selection

Explanation

(1) Charles Drawin proposed the theory of natural selection after making many observations on different specimens. He published a concept 'Survival of the fittest'.
(2) Drawin explains this concept as follows: all the organisms reproduce prolifically. Therefore, there is always a competition for food, mate, etc. Only those organisms survive which show the adaptations for sustaining this struggle.
(3) Natural selection plays important role by selecting only those organisms which are fit to live. Those that do not have better adaptations, perish. Selected sustaining organisms then perform reproduction and form new species in a very long period of time.
(4) Darwin published his views in the book titled 'Origin of Species'.