What is the reason for the struggle for existence?

The struggle for existence is associated with the natural development of organisms. There is constant natural competition between all creatures: they fight with each other for territory, food, etc. Clashes also occur between representatives of the same species (for example, for the female during the breeding season). The struggle for existence leads to the emergence of the so-called natural selection, thanks to which only the strongest individuals survive. Thus, the gene pool of a particular species is improved and its future is secured.