Solution:-

In 1859, Darwin revealed his famed book “The Origin of Species” during which he projected the concept of survival of the fittest. Theory of evolution doesn’t specifically mean what evolution is, however it explains however evolution might need occurred in nature. His “Theory of Natural Selection” relies on bound noticeable facts. These facts are: (i) Overproduction:- living beings, each plants and animals, have associate degree innate need to provide their own offspring so their race could continue. it’s been discovered that additional people square measure made to extend the possibility of their survival. (ii) Struggle for existence:-According to Darwin, people multiply in a very geometric quantitative relation whereas area and food stay nearly constant. This ends up in a struggle for existence among the organism. During this struggle, there’s intense competition between organisms for favourable shelter, climate, food provide and breeding places. (iii)Variation:- Even the offspring of identical oldsters aren’t specifically alike all told respects. Such a distinction is understood as variations. (iv) Survival of the fittest:- throughout the struggle for existence, solely those people will survive that have advantageous adaptions or variations.