Answer:
According to Darwin's theory every living organisms will struggle to survive and the strongest will live as it is fittest organism. The survival of fittest is known as natural selection. The fit organisms again has to struggle with changing environment to live. This is a continuous process and leads to evolution.
Step-by-step explanation:
Darwin is known as the father of evolution. He gave different theories of evolution in his book " Origin of Species " . According to this theory, every living organism reproduces the enormous number of organisms with time. Then their population will grow, and the earth will overcrowd with the increase in living creatures. In reality, it does not happen. There is a balance between the number of organisms and nature. He told this is due to the struggle among the organisms and with their environment. Thus the fittest organism will survive and weaker organisms would perish. The limited food, and space results the struggle. Organisms has to struggle with their species, other species and with the environment.The strongest will live and again it has to struggle to retain its position in the nature. This process is called survival of fittest or natural selection. It is a ongoing process as nature is a dynamic entity. The fittest organisms will always survive and live for longer. The old and weak would destroy with time. This has shown in other fields- if a religious thought is old, regid, and harmful for society, with time it would discard by the society. The new scientific research also discard the older theories. The good example is pluto is no longer a planet in our solar system.
Literature is the mirror of our society and with changing time new literature will write to show what is happening in the present society. Thus Darwin's theory of struggle for existence and natural selection has its impact on other aspects.